51969021 has 12 divisors (see below), whose sum is σ = 75032928. Its totient is φ = 31980624.

The previous prime is 51968993. The next prime is 51969059. The reversal of 51969021 is 12096915.

It is not a de Polignac number, because 51969021 - 2⁷ = 51968893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51969061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50745 + ... + 51758.

It is an arithmetic number, because the mean of its divisors is an integer number (6252744).

Almost surely, 2^51969021 is an apocalyptic number.

It is an amenable number.

51969021 is a deficient number, since it is larger than the sum of its proper divisors (23063907).

51969021 is a wasteful number, since it uses less digits than its factorization.

51969021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102532 (or 102519 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 51969021 is about 7208.9542237415. The cubic root of 51969021 is about 373.1769795068.

The spelling of 51969021 in words is "fifty-one million, nine hundred sixty-nine thousand, twenty-one".