52621920921 has 16 divisors (see below), whose sum is σ = 74319989184. Its totient is φ = 33004245504.

The previous prime is 52621920917. The next prime is 52621920979. The reversal of 52621920921 is 12902912625.

It is not a de Polignac number, because 52621920921 - 2² = 52621920917 is a prime.

It is a super-2 number, since 2×52621920921² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 52621920921.

It is not an unprimeable number, because it can be changed into a prime (52621924921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82491 + ... + 334736.

It is an arithmetic number, because the mean of its divisors is an integer number (4644999324).

Almost surely, 2^52621920921 is an apocalyptic number.

52621920921 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

52621920921 is a deficient number, since it is larger than the sum of its proper divisors (21698068263).

52621920921 is a wasteful number, since it uses less digits than its factorization.

52621920921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419720.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 52621920921 in words is "fifty-two billion, six hundred twenty-one million, nine hundred twenty thousand, nine hundred twenty-one".