21418125852 has 48 divisors (see below), whose sum is σ = 53439335712. Its totient is φ = 6652876800.

The previous prime is 21418125851. The next prime is 21418125853. The reversal of 21418125852 is 25852181412.

It is an interprime number because it is at equal distance from previous prime (21418125851) and next prime (21418125853).

It is a super-2 number, since 2×21418125852² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21418125852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21418125851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499153 + ... + 540360.

It is an arithmetic number, because the mean of its divisors is an integer number (1113319494).

Almost surely, 2^21418125852 is an apocalyptic number.

It is an amenable number.

21418125852 is an abundant number, since it is smaller than the sum of its proper divisors (32021209860).

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

21418125852 is a wasteful number, since it uses less digits than its factorization.

21418125852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039638 (or 1039636 counting only the distinct ones).

The product of its digits is 51200, while the sum is 39.

The spelling of 21418125852 in words is "twenty-one billion, four hundred eighteen million, one hundred twenty-five thousand, eight hundred fifty-two".