21069925643639 has 2 divisors, whose sum is σ = 21069925643640. Its totient is φ = 21069925643638.

The previous prime is 21069925643609. The next prime is 21069925643659. The reversal of 21069925643639 is 93634652996012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21069925643639 - 2¹⁶ = 21069925578103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21069925643609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10534962821819 + 10534962821820.

It is an arithmetic number, because the mean of its divisors is an integer number (10534962821820).

Almost surely, 2^{21069925643639} is an apocalyptic number.

21069925643639 is a deficient number, since it is larger than the sum of its proper divisors (1).

21069925643639 is an equidigital number, since it uses as much as digits as its factorization.

21069925643639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113374080, while the sum is 65.

The spelling of 21069925643639 in words is "twenty-one trillion, sixty-nine billion, nine hundred twenty-five million, six hundred forty-three thousand, six hundred thirty-nine".