51001415421 has 48 divisors (see below), whose sum is σ = 78215542272. Its totient is φ = 29506688640.

The previous prime is 51001415329. The next prime is 51001415441. The reversal of 51001415421 is 12451410015.

It is not a de Polignac number, because 51001415421 - 2¹⁷ = 51001284349 is a prime.

It is a super-2 number, since 2×51001415421² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51001415391 and 51001415400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51001415441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 676020 + ... + 747666.

It is an arithmetic number, because the mean of its divisors is an integer number (1629490464).

Almost surely, 2^51001415421 is an apocalyptic number.

It is an amenable number.

51001415421 is a deficient number, since it is larger than the sum of its proper divisors (27214126851).

51001415421 is a wasteful number, since it uses less digits than its factorization.

51001415421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71762 (or 71751 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 51001415421 its reverse (12451410015), we get a palindrome (63452825436).

The spelling of 51001415421 in words is "fifty-one billion, one million, four hundred fifteen thousand, four hundred twenty-one".