21121102112012 has 48 divisors (see below), whose sum is σ = 43069476667392. Its totient is φ = 8874868317120.

The previous prime is 21121102111933. The next prime is 21121102112021. The reversal of 21121102112012 is 21021120112112.

It is a super-2 number, since 2×21121102112012² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2889164 + ... + 7112627.

It is an arithmetic number, because the mean of its divisors is an integer number (897280763904).

Almost surely, 2^{21121102112012} is an apocalyptic number.

It is an amenable number.

21121102112012 is an abundant number, since it is smaller than the sum of its proper divisors (21948374555380).

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

21121102112012 is a wasteful number, since it uses less digits than its factorization.

21121102112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10003278 (or 10003276 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121102112012 its reverse (21021120112112), we get a palindrome (42142222224124).

The spelling of 21121102112012 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, one hundred twelve thousand, twelve".