21002100122110 has 16 divisors (see below), whose sum is σ = 37826512528896. Its totient is φ = 8395788424608.

The previous prime is 21002100122099. The next prime is 21002100122149. The reversal of 21002100122110 is 1122100120012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 631435569 + ... + 631468828.

It is an arithmetic number, because the mean of its divisors is an integer number (2364157033056).

Almost surely, 2^{21002100122110} is an apocalyptic number.

21002100122110 is a deficient number, since it is larger than the sum of its proper divisors (16824412406786).

21002100122110 is a wasteful number, since it uses less digits than its factorization.

21002100122110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262906067.

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

Adding to 21002100122110 its reverse (1122100120012), we get a palindrome (22124200242122).

The spelling of 21002100122110 in words is "twenty-one trillion, two billion, one hundred million, one hundred twenty-two thousand, one hundred ten".