51421998106 has 16 divisors (see below), whose sum is σ = 81677177064. Its totient is φ = 24196529664.

The previous prime is 51421998079. The next prime is 51421998113. The reversal of 51421998106 is 60189912415.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49755317481 + 1666680625 = 223059^2 + 40825^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387406 + ... + 502918.

Almost surely, 2^51421998106 is an apocalyptic number.

51421998106 is a deficient number, since it is larger than the sum of its proper divisors (30255178958).

51421998106 is a wasteful number, since it uses less digits than its factorization.

51421998106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128625.

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 51421998106 in words is "fifty-one billion, four hundred twenty-one million, nine hundred ninety-eight thousand, one hundred six".