51421998105 has 12 divisors (see below), whose sum is σ = 89131463460. Its totient is φ = 27425065632.

The previous prime is 51421998079. The next prime is 51421998113. The reversal of 51421998105 is 50189912415.

51421998105 is a `hidden beast` number, since 514 + 21 + 9 + 9 + 8 + 105 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31070407824 + 20351590281 = 176268^2 + 142659^2 .

It is not a de Polignac number, because 51421998105 - 2⁵ = 51421998073 is a prime.

It is a super-2 number, since 2×51421998105² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1142711069 = 51421998105 / (5 + 1 + 4 + 2 + 1 + 9 + 9 + 8 + 1 + 0 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 571355490 + ... + 571355579.

It is an arithmetic number, because the mean of its divisors is an integer number (7427621955).

Almost surely, 2^51421998105 is an apocalyptic number.

It is an amenable number.

51421998105 is a deficient number, since it is larger than the sum of its proper divisors (37709465355).

51421998105 is a wasteful number, since it uses less digits than its factorization.

51421998105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142711080 (or 1142711077 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The spelling of 51421998105 in words is "fifty-one billion, four hundred twenty-one million, nine hundred ninety-eight thousand, one hundred five".