42551102421 has 12 divisors (see below), whose sum is σ = 61904883040. Its totient is φ = 28163318760.

The previous prime is 42551102383. The next prime is 42551102467. The reversal of 42551102421 is 12420115524.

It is a happy number.

42551102421 is a `hidden beast` number, since 4 + 2 + 551 + 102 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 42551102421 - 2²³ = 42542713813 is a prime.

It is a super-2 number, since 2×42551102421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42551102521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17005585 + ... + 17008086.

Almost surely, 2^42551102421 is an apocalyptic number.

It is an amenable number.

42551102421 is a deficient number, since it is larger than the sum of its proper divisors (19353780619).

42551102421 is a wasteful number, since it uses less digits than its factorization.

42551102421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34013816 (or 34013813 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 42551102421 its reverse (12420115524), we get a palindrome (54971217945).

The spelling of 42551102421 in words is "forty-two billion, five hundred fifty-one million, one hundred two thousand, four hundred twenty-one".