51425033021 has 4 divisors (see below), whose sum is σ = 51428901600. Its totient is φ = 51421164444.

The previous prime is 51425033003. The next prime is 51425033039. The reversal of 51425033021 is 12033052415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12033052415 = 5 ⋅2406610483.

It is an interprime number because it is at equal distance from previous prime (51425033003) and next prime (51425033039).

It is a cyclic number.

It is not a de Polignac number, because 51425033021 - 2²⁶ = 51357924157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51425033041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1914281 + ... + 1940958.

It is an arithmetic number, because the mean of its divisors is an integer number (12857225400).

Almost surely, 2^51425033021 is an apocalyptic number.

It is an amenable number.

51425033021 is a deficient number, since it is larger than the sum of its proper divisors (3868579).

51425033021 is a wasteful number, since it uses less digits than its factorization.

51425033021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3868578.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 51425033021 its reverse (12033052415), we get a palindrome (63458085436).

The spelling of 51425033021 in words is "fifty-one billion, four hundred twenty-five million, thirty-three thousand, twenty-one".