21201220012112 has 40 divisors (see below), whose sum is σ = 49416377476800. Its totient is φ = 8608014139392.

The previous prime is 21201220012087. The next prime is 21201220012121. The reversal of 21201220012112 is 21121002210212.

It is a congruent number.

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, 4981487537 + ... + 4981491792.

It is an arithmetic number, because the mean of its divisors is an integer number (1235409436920).

Almost surely, 2^{21201220012112} is an apocalyptic number.

It is an amenable number.

21201220012112 is an abundant number, since it is smaller than the sum of its proper divisors (28215157464688).

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

21201220012112 is a wasteful number, since it uses less digits than its factorization.

21201220012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9962979363 (or 9962979357 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21201220012112 its reverse (21121002210212), we get a palindrome (42322222222324).

The spelling of 21201220012112 in words is "twenty-one trillion, two hundred one billion, two hundred twenty million, twelve thousand, one hundred twelve".