633662021 has 2 divisors, whose sum is σ = 633662022. Its totient is φ = 633662020.

The previous prime is 633661999. The next prime is 633662137. The reversal of 633662021 is 120266336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389865025 + 243796996 = 19745^2 + 15614^2 .

It is a cyclic number.

It is not a de Polignac number, because 633662021 - 2⁶ = 633661957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (633662221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316831010 + 316831011.

It is an arithmetic number, because the mean of its divisors is an integer number (316831011).

Almost surely, 2^633662021 is an apocalyptic number.

It is an amenable number.

633662021 is a deficient number, since it is larger than the sum of its proper divisors (1).

633662021 is an equidigital number, since it uses as much as digits as its factorization.

633662021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 633662021 is about 25172.6442989210. The cubic root of 633662021 is about 858.9196913776.

The spelling of 633662021 in words is "six hundred thirty-three million, six hundred sixty-two thousand, twenty-one".