21001121202102 has 32 divisors (see below), whose sum is σ = 42303786693120. Its totient is φ = 6950228914080.

The previous prime is 21001121202079. The next prime is 21001121202211. The reversal of 21001121202102 is 20120212110012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13323424 + ... + 14816067.

It is an arithmetic number, because the mean of its divisors is an integer number (1321993334160).

Almost surely, 2^{21001121202102} is an apocalyptic number.

21001121202102 is an abundant number, since it is smaller than the sum of its proper divisors (21302665491018).

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

21001121202102 is a wasteful number, since it uses less digits than its factorization.

21001121202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28140388.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21001121202102 its reverse (20120212110012), we get a palindrome (41121333312114).

The spelling of 21001121202102 in words is "twenty-one trillion, one billion, one hundred twenty-one million, two hundred two thousand, one hundred two".