21663411150431 has 2 divisors, whose sum is σ = 21663411150432. Its totient is φ = 21663411150430.

The previous prime is 21663411150421. The next prime is 21663411150481. The reversal of 21663411150431 is 13405111436612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21663411150431 is a prime.

It is a super-2 number, since 2×21663411150431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21663411150401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10831705575215 + 10831705575216.

It is an arithmetic number, because the mean of its divisors is an integer number (10831705575216).

Almost surely, 2^{21663411150431} is an apocalyptic number.

21663411150431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21663411150431 is an equidigital number, since it uses as much as digits as its factorization.

21663411150431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 21663411150431 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, one hundred fifty thousand, four hundred thirty-one".