21000122120102 has 4 divisors (see below), whose sum is σ = 31500183180156. Its totient is φ = 10500061060050.

The previous prime is 21000122120099. The next prime is 21000122120123. The reversal of 21000122120102 is 20102122100012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250030530024 + ... + 5250030530027.

It is an arithmetic number, because the mean of its divisors is an integer number (7875045795039).

Almost surely, 2^{21000122120102} is an apocalyptic number.

21000122120102 is a deficient number, since it is larger than the sum of its proper divisors (10500061060054).

21000122120102 is a wasteful number, since it uses less digits than its factorization.

21000122120102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500061060053.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000122120102 its reverse (20102122100012), we get a palindrome (41102244220114).

The spelling of 21000122120102 in words is "twenty-one trillion, one hundred twenty-two million, one hundred twenty thousand, one hundred two".