51335513421 has 8 divisors (see below), whose sum is σ = 68450952960. Its totient is φ = 34221874752.

The previous prime is 51335513419. The next prime is 51335513423. The reversal of 51335513421 is 12431553315.

It is an interprime number because it is at equal distance from previous prime (51335513419) and next prime (51335513423).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51335513421 - 2¹ = 51335513419 is a prime.

It is a super-2 number, since 2×51335513421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51335513423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382236 + ... + 498773.

It is an arithmetic number, because the mean of its divisors is an integer number (8556369120).

Almost surely, 2^51335513421 is an apocalyptic number.

It is an amenable number.

51335513421 is a deficient number, since it is larger than the sum of its proper divisors (17115439539).

51335513421 is a wasteful number, since it uses less digits than its factorization.

51335513421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900435.

The product of its digits is 27000, while the sum is 33.

The spelling of 51335513421 in words is "fifty-one billion, three hundred thirty-five million, five hundred thirteen thousand, four hundred twenty-one".