21121425112 has 16 divisors (see below), whose sum is σ = 39722322600. Its totient is φ = 10528805760.

The previous prime is 21121425109. The next prime is 21121425181. The reversal of 21121425112 is 21152412112.

It is a super-2 number, since 2×21121425112² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3985537 + ... + 3990832.

Almost surely, 2^21121425112 is an apocalyptic number.

It is an amenable number.

21121425112 is a deficient number, since it is larger than the sum of its proper divisors (18600897488).

21121425112 is a wasteful number, since it uses less digits than its factorization.

21121425112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7976706 (or 7976702 counting only the distinct ones).

The product of its digits is 320, while the sum is 22.

Adding to 21121425112 its reverse (21152412112), we get a palindrome (42273837224).

The spelling of 21121425112 in words is "twenty-one billion, one hundred twenty-one million, four hundred twenty-five thousand, one hundred twelve".