21125114412 has 24 divisors (see below), whose sum is σ = 49345018800. Its totient is φ = 7034121216.

The previous prime is 21125114407. The next prime is 21125114419. The reversal of 21125114412 is 21441152112.

It is not an unprimeable number, because it can be changed into a prime (21125114419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936337 + ... + 958632.

It is an arithmetic number, because the mean of its divisors is an integer number (2056042450).

Almost surely, 2^21125114412 is an apocalyptic number.

It is an amenable number.

21125114412 is an abundant number, since it is smaller than the sum of its proper divisors (28219904388).

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

21125114412 is a wasteful number, since it uses less digits than its factorization.

21125114412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895905 (or 1895903 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

Adding to 21125114412 its reverse (21441152112), we get a palindrome (42566266524).

The spelling of 21125114412 in words is "twenty-one billion, one hundred twenty-five million, one hundred fourteen thousand, four hundred twelve".