210211202021 has 4 divisors (see below), whose sum is σ = 210216159372. Its totient is φ = 210206244672.

The previous prime is 210211201979. The next prime is 210211202023. The reversal of 210211202021 is 120202112012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60511080100 + 149700121921 = 245990^2 + 386911^2 .

It is a cyclic number.

It is not a de Polignac number, because 210211202021 - 2²⁶ = 210144093157 is a prime.

It is a super-2 number, since 2×210211202021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210211201987 and 210211202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210211202023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2414516 + ... + 2500061.

It is an arithmetic number, because the mean of its divisors is an integer number (52554039843).

Almost surely, 2^210211202021 is an apocalyptic number.

It is an amenable number.

210211202021 is a deficient number, since it is larger than the sum of its proper divisors (4957351).

210211202021 is an equidigital number, since it uses as much as digits as its factorization.

210211202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4957350.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210211202021 its reverse (120202112012), we get a palindrome (330413314033).

Subtracting from 210211202021 its reverse (120202112012), we obtain a palindrome (90009090009).

The spelling of 210211202021 in words is "two hundred ten billion, two hundred eleven million, two hundred two thousand, twenty-one".