21369942527 has 2 divisors, whose sum is σ = 21369942528. Its totient is φ = 21369942526.

The previous prime is 21369942511. The next prime is 21369942541. The reversal of 21369942527 is 72524996312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21369942527 - 2⁴ = 21369942511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21369942557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10684971263 + 10684971264.

It is an arithmetic number, because the mean of its divisors is an integer number (10684971264).

Almost surely, 2^21369942527 is an apocalyptic number.

21369942527 is a deficient number, since it is larger than the sum of its proper divisors (1).

21369942527 is an equidigital number, since it uses as much as digits as its factorization.

21369942527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The spelling of 21369942527 in words is "twenty-one billion, three hundred sixty-nine million, nine hundred forty-two thousand, five hundred twenty-seven".