55251021420 has 72 divisors (see below), whose sum is σ = 191536878624. Its totient is φ = 12628804608.

The previous prime is 55251021407. The next prime is 55251021421. The reversal of 55251021420 is 2412015255.

55251021420 is a `hidden beast` number, since 5 + 5 + 2 + 510 + 2 + 142 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (55251021421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21923749 + ... + 21926268.

Almost surely, 2^55251021420 is an apocalyptic number.

It is an amenable number.

55251021420 is an abundant number, since it is smaller than the sum of its proper divisors (136285857204).

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

55251021420 is a wasteful number, since it uses less digits than its factorization.

55251021420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43850039 (or 43850034 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 55251021420 its reverse (2412015255), we get a palindrome (57663036675).

The spelling of 55251021420 in words is "fifty-five billion, two hundred fifty-one million, twenty-one thousand, four hundred twenty".