21353692667 has 2 divisors, whose sum is σ = 21353692668. Its totient is φ = 21353692666.

The previous prime is 21353692651. The next prime is 21353692733. The reversal of 21353692667 is 76629635312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21353692667 - 2⁴ = 21353692651 is a prime.

It is not a weakly prime, because it can be changed into another prime (21353692627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676846333 + 10676846334.

It is an arithmetic number, because the mean of its divisors is an integer number (10676846334).

Almost surely, 2^21353692667 is an apocalyptic number.

21353692667 is a deficient number, since it is larger than the sum of its proper divisors (1).

21353692667 is an equidigital number, since it uses as much as digits as its factorization.

21353692667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 50.

The spelling of 21353692667 in words is "twenty-one billion, three hundred fifty-three million, six hundred ninety-two thousand, six hundred sixty-seven".