21120020121010 has 16 divisors (see below), whose sum is σ = 38062228257216. Its totient is φ = 8437743150768.

The previous prime is 21120020120959. The next prime is 21120020121029. The reversal of 21120020121010 is 1012102002112.

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, 1283103564 + ... + 1283120023.

It is an arithmetic number, because the mean of its divisors is an integer number (2378889266076).

Almost surely, 2^{21120020121010} is an apocalyptic number.

21120020121010 is a deficient number, since it is larger than the sum of its proper divisors (16942208136206).

21120020121010 is a wasteful number, since it uses less digits than its factorization.

21120020121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566224417.

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

Adding to 21120020121010 its reverse (1012102002112), we get a palindrome (22132122123122).

The spelling of 21120020121010 in words is "twenty-one trillion, one hundred twenty billion, twenty million, one hundred twenty-one thousand, ten".