51921321963 has 32 divisors (see below), whose sum is σ = 82714598400. Its totient is φ = 28379216448.

The previous prime is 51921321931. The next prime is 51921321967. The reversal of 51921321963 is 36912312915.

It is not a de Polignac number, because 51921321963 - 2⁵ = 51921321931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51921321967) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153903 + ... + 357111.

It is an arithmetic number, because the mean of its divisors is an integer number (2584831200).

Almost surely, 2^51921321963 is an apocalyptic number.

51921321963 is a deficient number, since it is larger than the sum of its proper divisors (30793276437).

51921321963 is an equidigital number, since it uses as much as digits as its factorization.

51921321963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203288 (or 203242 counting only the distinct ones).

The product of its digits is 87480, while the sum is 42.

The spelling of 51921321963 in words is "fifty-one billion, nine hundred twenty-one million, three hundred twenty-one thousand, nine hundred sixty-three".