21002100111010 has 16 divisors (see below), whose sum is σ = 37807906964472. Its totient is φ = 8399922985600.

The previous prime is 21002100110993. The next prime is 21002100111023. The reversal of 21002100111010 is 1011100120012.

It can be written as a sum of positive squares in 4 ways, for example, as 18519260166801 + 2482839944209 = 4303401^2 + 1575703^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 114536161 + ... + 114719380.

Almost surely, 2^{21002100111010} is an apocalyptic number.

21002100111010 is a deficient number, since it is larger than the sum of its proper divisors (16805806853462).

21002100111010 is a wasteful number, since it uses less digits than its factorization.

21002100111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229264709.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21002100111010 its reverse (1011100120012), we get a palindrome (22013200231022).

The spelling of 21002100111010 in words is "twenty-one trillion, two billion, one hundred million, one hundred eleven thousand, ten".