21211012020112 has 20 divisors (see below), whose sum is σ = 41096450011660. Its totient is φ = 10605476533248.

The previous prime is 21211012020097. The next prime is 21211012020199. The reversal of 21211012020112 is 21102021011212.

It can be written as a sum of positive squares in 2 ways, for example, as 435684484096 + 20775327536016 = 660064^2 + 4557996^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4825564 + ... + 8106052.

It is an arithmetic number, because the mean of its divisors is an integer number (2054822500583).

Almost surely, 2^{21211012020112} is an apocalyptic number.

It is an amenable number.

21211012020112 is a deficient number, since it is larger than the sum of its proper divisors (19885437991548).

21211012020112 is a wasteful number, since it uses less digits than its factorization.

21211012020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684610 (or 3684604 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21211012020112 its reverse (21102021011212), we get a palindrome (42313033031324).

The spelling of 21211012020112 in words is "twenty-one trillion, two hundred eleven billion, twelve million, twenty thousand, one hundred twelve".