21210102111012 has 24 divisors (see below), whose sum is σ = 49490315445312. Its totient is φ = 7070023010400.

The previous prime is 21210102111007. The next prime is 21210102111031. The reversal of 21210102111012 is 21011120101212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21210102110982 and 21210102111000.

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, 11304562 + ... + 13046582.

It is an arithmetic number, because the mean of its divisors is an integer number (2062096476888).

Almost surely, 2^{21210102111012} is an apocalyptic number.

It is an amenable number.

21210102111012 is an abundant number, since it is smaller than the sum of its proper divisors (28280213334300).

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

21210102111012 is a wasteful number, since it uses less digits than its factorization.

21210102111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756659 (or 2756657 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21210102111012 its reverse (21011120101212), we get a palindrome (42221222212224).

The spelling of 21210102111012 in words is "twenty-one trillion, two hundred ten billion, one hundred two million, one hundred eleven thousand, twelve".