51025412021 has 2 divisors, whose sum is σ = 51025412022. Its totient is φ = 51025412020.

The previous prime is 51025412003. The next prime is 51025412029. The reversal of 51025412021 is 12021452015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46694455921 + 4330956100 = 216089^2 + 65810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51025412021 is a prime.

It is a super-2 number, since 2×51025412021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51025412029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25512706010 + 25512706011.

It is an arithmetic number, because the mean of its divisors is an integer number (25512706011).

Almost surely, 2^51025412021 is an apocalyptic number.

It is an amenable number.

51025412021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51025412021 is an equidigital number, since it uses as much as digits as its factorization.

51025412021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 51025412021 its reverse (12021452015), we get a palindrome (63046864036).

The spelling of 51025412021 in words is "fifty-one billion, twenty-five million, four hundred twelve thousand, twenty-one".