51401021 has 32 divisors (see below), whose sum is σ = 64627200. Its totient is φ = 39916800.

The previous prime is 51400991. The next prime is 51401027. The reversal of 51401021 is 12010415.

It is not a de Polignac number, because 51401021 - 2⁶ = 51400957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51400987 and 51401005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51401027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 471515 + ... + 471623.

It is an arithmetic number, because the mean of its divisors is an integer number (2019600).

Almost surely, 2^51401021 is an apocalyptic number.

It is an amenable number.

51401021 is a deficient number, since it is larger than the sum of its proper divisors (13226179).

51401021 is a wasteful number, since it uses less digits than its factorization.

51401021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 51401021 is about 7169.4505368264. The cubic root of 51401021 is about 371.8124391711.

Adding to 51401021 its reverse (12010415), we get a palindrome (63411436).

The spelling of 51401021 in words is "fifty-one million, four hundred one thousand, twenty-one".