211254421045 has 4 divisors (see below), whose sum is σ = 253505305260. Its totient is φ = 169003536832.

The previous prime is 211254421019. The next prime is 211254421121. The reversal of 211254421045 is 540124452112.

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 37232789764 + 174021631281 = 192958^2 + 417159^2 .

It is a cyclic number.

It is not a de Polignac number, because 211254421045 - 2⁷ = 211254420917 is a prime.

It is a super-2 number, since 2×211254421045² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211254420998 and 211254421016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21125442100 + ... + 21125442109.

It is an arithmetic number, because the mean of its divisors is an integer number (63376326315).

Almost surely, 2^211254421045 is an apocalyptic number.

It is an amenable number.

211254421045 is a deficient number, since it is larger than the sum of its proper divisors (42250884215).

211254421045 is an equidigital number, since it uses as much as digits as its factorization.

211254421045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42250884214.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 211254421045 its reverse (540124452112), we get a palindrome (751378873157).

The spelling of 211254421045 in words is "two hundred eleven billion, two hundred fifty-four million, four hundred twenty-one thousand, forty-five".