51336021 has 8 divisors (see below), whose sum is σ = 74670624. Its totient is φ = 31112720.

The previous prime is 51336011. The next prime is 51336049. The reversal of 51336021 is 12063315.

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

It is a cyclic number.

It is not a de Polignac number, because 51336021 - 2⁶ = 51335957 is a prime.

It is a super-2 number, since 2×51336021² = 5270774104224882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51336011) 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, 777786 + ... + 777851.

It is an arithmetic number, because the mean of its divisors is an integer number (9333828).

Almost surely, 2^51336021 is an apocalyptic number.

It is an amenable number.

51336021 is a deficient number, since it is larger than the sum of its proper divisors (23334603).

51336021 is a wasteful number, since it uses less digits than its factorization.

51336021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555651.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 51336021 is about 7164.9159799679. The cubic root of 51336021 is about 371.6556458980.

Adding to 51336021 its reverse (12063315), we get a palindrome (63399336).

The spelling of 51336021 in words is "fifty-one million, three hundred thirty-six thousand, twenty-one".