21121022111002 has 64 divisors (see below), whose sum is σ = 36934410958848. Its totient is φ = 8964072040000.

The previous prime is 21121022110879. The next prime is 21121022111009. The reversal of 21121022111002 is 20011122012112.

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 31 ways as a sum of consecutive naturals, for example, 718113 + ... + 6538939.

It is an arithmetic number, because the mean of its divisors is an integer number (577100171232).

Almost surely, 2^{21121022111002} is an apocalyptic number.

21121022111002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121022111002 is a deficient number, since it is larger than the sum of its proper divisors (15813388847846).

21121022111002 is a wasteful number, since it uses less digits than its factorization.

21121022111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5821035.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21121022111002 its reverse (20011122012112), we get a palindrome (41132144123114).

The spelling of 21121022111002 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, one hundred eleven thousand, two".