21314742266639 has 2 divisors, whose sum is σ = 21314742266640. Its totient is φ = 21314742266638.

The previous prime is 21314742266633. The next prime is 21314742266677. The reversal of 21314742266639 is 93666224741312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21314742266639 - 2¹² = 21314742262543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21314742266633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10657371133319 + 10657371133320.

It is an arithmetic number, because the mean of its divisors is an integer number (10657371133320).

Almost surely, 2^{21314742266639} is an apocalyptic number.

21314742266639 is a deficient number, since it is larger than the sum of its proper divisors (1).

21314742266639 is an equidigital number, since it uses as much as digits as its factorization.

21314742266639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 56.

The spelling of 21314742266639 in words is "twenty-one trillion, three hundred fourteen billion, seven hundred forty-two million, two hundred sixty-six thousand, six hundred thirty-nine".