21121502165022 has 64 divisors (see below), whose sum is σ = 49189755561984. Its totient is φ = 5920715623680.

The previous prime is 21121502165009. The next prime is 21121502165051. The reversal of 21121502165022 is 22056120512112.

It is a super-2 number, since 2×21121502165022² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132160122 + ... + 132319842.

It is an arithmetic number, because the mean of its divisors is an integer number (768589930656).

Almost surely, 2^{21121502165022} is an apocalyptic number.

21121502165022 is an abundant number, since it is smaller than the sum of its proper divisors (28068253396962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121502165022 is a wasteful number, since it uses less digits than its factorization.

21121502165022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219193.

The product of its (nonzero) digits is 4800, while the sum is 30.

Adding to 21121502165022 its reverse (22056120512112), we get a palindrome (43177622677134).

The spelling of 21121502165022 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred two million, one hundred sixty-five thousand, twenty-two".