63291992021 has 2 divisors, whose sum is σ = 63291992022. Its totient is φ = 63291992020.

The previous prime is 63291992003. The next prime is 63291992033. The reversal of 63291992021 is 12029919236.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51952084900 + 11339907121 = 227930^2 + 106489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63291992021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63291992041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31645996010 + 31645996011.

It is an arithmetic number, because the mean of its divisors is an integer number (31645996011).

Almost surely, 2^63291992021 is an apocalyptic number.

It is an amenable number.

63291992021 is a deficient number, since it is larger than the sum of its proper divisors (1).

63291992021 is an equidigital number, since it uses as much as digits as its factorization.

63291992021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The spelling of 63291992021 in words is "sixty-three billion, two hundred ninety-one million, nine hundred ninety-two thousand, twenty-one".