21630652393501 has 2 divisors, whose sum is σ = 21630652393502. Its totient is φ = 21630652393500.

The previous prime is 21630652393477. The next prime is 21630652393507. The reversal of 21630652393501 is 10539325603612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19386858108601 + 2243794284900 = 4403051^2 + 1497930^2 .

It is a cyclic number.

It is not a de Polignac number, because 21630652393501 - 2³⁷ = 21493213440029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21630652393507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10815326196750 + 10815326196751.

It is an arithmetic number, because the mean of its divisors is an integer number (10815326196751).

Almost surely, 2^{21630652393501} is an apocalyptic number.

It is an amenable number.

21630652393501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21630652393501 is an equidigital number, since it uses as much as digits as its factorization.

21630652393501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 46.

The spelling of 21630652393501 in words is "twenty-one trillion, six hundred thirty billion, six hundred fifty-two million, three hundred ninety-three thousand, five hundred one".