21001121020102 has 16 divisors (see below), whose sum is σ = 33776933290560. Its totient is φ = 9757780725888.

The previous prime is 21001121020081. The next prime is 21001121020163. The reversal of 21001121020102 is 20102012110012.

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 7 ways as a sum of consecutive naturals, for example, 3909364593 + ... + 3909369964.

It is an arithmetic number, because the mean of its divisors is an integer number (2111058330660).

Almost surely, 2^{21001121020102} is an apocalyptic number.

21001121020102 is a deficient number, since it is larger than the sum of its proper divisors (12775812270458).

21001121020102 is a wasteful number, since it uses less digits than its factorization.

21001121020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7818734655.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001121020102 its reverse (20102012110012), we get a palindrome (41103133130114).

The spelling of 21001121020102 in words is "twenty-one trillion, one billion, one hundred twenty-one million, twenty thousand, one hundred two".