21201111012112 has 20 divisors (see below), whose sum is σ = 41077290535936. Its totient is φ = 10600519906080.

The previous prime is 21201111012091. The next prime is 21201111012113. The reversal of 21201111012112 is 21121011110212.

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

It is not an unprimeable number, because it can be changed into a prime (21201111012113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3070033 + ... + 7199119.

Almost surely, 2^{21201111012112} is an apocalyptic number.

It is an amenable number.

21201111012112 is a deficient number, since it is larger than the sum of its proper divisors (19876179523824).

21201111012112 is a wasteful number, since it uses less digits than its factorization.

21201111012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450006 (or 4450000 counting only the distinct ones).

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

Adding to 21201111012112 its reverse (21121011110212), we get a palindrome (42322122122324).

The spelling of 21201111012112 in words is "twenty-one trillion, two hundred one billion, one hundred eleven million, twelve thousand, one hundred twelve".