211121220331021 has 32 divisors (see below), whose sum is σ = 286385760476928. Its totient is φ = 150289903319040.

The previous prime is 211121220330989. The next prime is 211121220331141. The reversal of 211121220331021 is 120133022121112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211121220331021 - 2⁵ = 211121220330989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121220330983 and 211121220331001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121220341021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1087069450 + ... + 1087263643.

It is an arithmetic number, because the mean of its divisors is an integer number (8949555014904).

Almost surely, 2^{211121220331021} is an apocalyptic number.

It is an amenable number.

211121220331021 is a deficient number, since it is larger than the sum of its proper divisors (75264540145907).

211121220331021 is a wasteful number, since it uses less digits than its factorization.

211121220331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174333221.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 211121220331021 its reverse (120133022121112), we get a palindrome (331254242452133).

The spelling of 211121220331021 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred twenty million, three hundred thirty-one thousand, twenty-one".