20021210221001 has 16 divisors (see below), whose sum is σ = 22023914831808. Its totient is φ = 18199374621120.

The previous prime is 20021210220997. The next prime is 20021210221073. The reversal of 20021210221001 is 10012201212002.

It is not a de Polignac number, because 20021210221001 - 2² = 20021210220997 is a prime.

It is a super-2 number, since 2×20021210221001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021210221501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13436801 + ... + 14852273.

It is an arithmetic number, because the mean of its divisors is an integer number (1376494676988).

Almost surely, 2^{20021210221001} is an apocalyptic number.

It is an amenable number.

20021210221001 is a deficient number, since it is larger than the sum of its proper divisors (2002704610807).

20021210221001 is a wasteful number, since it uses less digits than its factorization.

20021210221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426133 (or 1426111 counting only the distinct ones).

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

Adding to 20021210221001 its reverse (10012201212002), we get a palindrome (30033411433003).

The spelling of 20021210221001 in words is "twenty trillion, twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one".