21121425412 has 12 divisors (see below), whose sum is σ = 38569559616. Its totient is φ = 10101551240.

The previous prime is 21121425383. The next prime is 21121425491. The reversal of 21121425412 is 21452412112.

It is a super-2 number, since 2×21121425412² (a number of 21 digits) contains 22 as substring.

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, 114790264 + ... + 114790447.

It is an arithmetic number, because the mean of its divisors is an integer number (3214129968).

Almost surely, 2^21121425412 is an apocalyptic number.

It is an amenable number.

21121425412 is a deficient number, since it is larger than the sum of its proper divisors (17448134204).

21121425412 is a wasteful number, since it uses less digits than its factorization.

21121425412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229580738 (or 229580736 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

Adding to 21121425412 its reverse (21452412112), we get a palindrome (42573837524).

The spelling of 21121425412 in words is "twenty-one billion, one hundred twenty-one million, four hundred twenty-five thousand, four hundred twelve".