21000002021112 has 64 divisors (see below), whose sum is σ = 57505076560800. Its totient is φ = 6361055375360.

The previous prime is 21000002021003. The next prime is 21000002021143. The reversal of 21000002021112 is 21112020000012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 887412189 + ... + 887435852.

Almost surely, 2^{21000002021112} is an apocalyptic number.

It is an amenable number.

21000002021112 is an abundant number, since it is smaller than the sum of its proper divisors (36505074539688).

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

21000002021112 is a wasteful number, since it uses less digits than its factorization.

21000002021112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774848096 (or 1774848092 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21000002021112 its reverse (21112020000012), we get a palindrome (42112022021124).

The spelling of 21000002021112 in words is "twenty-one trillion, two million, twenty-one thousand, one hundred twelve".