21121022111008 has 24 divisors (see below), whose sum is σ = 41584972529520. Its totient is φ = 10559759246400.

The previous prime is 21121022110879. The next prime is 21121022111009. The reversal of 21121022111008 is 80011122012112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121022111008.

It is not an unprimeable number, because it can be changed into a prime (21121022111009) 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, 23037378 + ... + 23936641.

It is an arithmetic number, because the mean of its divisors is an integer number (1732707188730).

Almost surely, 2^{21121022111008} is an apocalyptic number.

It is an amenable number.

21121022111008 is a deficient number, since it is larger than the sum of its proper divisors (20463950418512).

21121022111008 is a wasteful number, since it uses less digits than its factorization.

21121022111008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46988080 (or 46988072 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 22.

The spelling of 21121022111008 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, one hundred eleven thousand, eight".