21314461643 has 2 divisors, whose sum is σ = 21314461644. Its totient is φ = 21314461642.

The previous prime is 21314461621. The next prime is 21314461661. The reversal of 21314461643 is 34616441312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21314461643 - 2¹⁰ = 21314460619 is a prime.

It is not a weakly prime, because it can be changed into another prime (21314461613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10657230821 + 10657230822.

It is an arithmetic number, because the mean of its divisors is an integer number (10657230822).

Almost surely, 2^21314461643 is an apocalyptic number.

21314461643 is a deficient number, since it is larger than the sum of its proper divisors (1).

21314461643 is an equidigital number, since it uses as much as digits as its factorization.

21314461643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 35.

The spelling of 21314461643 in words is "twenty-one billion, three hundred fourteen million, four hundred sixty-one thousand, six hundred forty-three".