21021011112012 has 24 divisors (see below), whose sum is σ = 49342732674816. Its totient is φ = 6965045597328.

The previous prime is 21021011111999. The next prime is 21021011112037. The reversal of 21021011112012 is 21021111012012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21021011111982 and 21021011112000.

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, 5244761248 + ... + 5244765255.

It is an arithmetic number, because the mean of its divisors is an integer number (2055947194784).

Almost surely, 2^{21021011112012} is an apocalyptic number.

It is an amenable number.

21021011112012 is an abundant number, since it is smaller than the sum of its proper divisors (28321721562804).

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

21021011112012 is a wasteful number, since it uses less digits than its factorization.

21021011112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10489526677 (or 10489526675 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21021011112012 its reverse (21021111012012), we get a palindrome (42042122124024).

The spelling of 21021011112012 in words is "twenty-one trillion, twenty-one billion, eleven million, one hundred twelve thousand, twelve".