63213971 has 2 divisors, whose sum is σ = 63213972. Its totient is φ = 63213970.

The previous prime is 63213961. The next prime is 63213977. The reversal of 63213971 is 17931236.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63213971 - 2⁶ = 63213907 is a prime.

It is a super-2 number, since 2×63213971² = 7992012259177682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63213977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31606985 + 31606986.

It is an arithmetic number, because the mean of its divisors is an integer number (31606986).

Almost surely, 2^63213971 is an apocalyptic number.

63213971 is a deficient number, since it is larger than the sum of its proper divisors (1).

63213971 is an equidigital number, since it uses as much as digits as its factorization.

63213971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 32.

The square root of 63213971 is about 7950.7214138089. The cubic root of 63213971 is about 398.3556894525.

The spelling of 63213971 in words is "sixty-three million, two hundred thirteen thousand, nine hundred seventy-one".