21386633363 has 2 divisors, whose sum is σ = 21386633364. Its totient is φ = 21386633362.

The previous prime is 21386633347. The next prime is 21386633371. The reversal of 21386633363 is 36333668312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21386633363 - 2⁴ = 21386633347 is a prime.

It is not a weakly prime, because it can be changed into another prime (21386633563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10693316681 + 10693316682.

It is an arithmetic number, because the mean of its divisors is an integer number (10693316682).

Almost surely, 2^21386633363 is an apocalyptic number.

21386633363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21386633363 is an equidigital number, since it uses as much as digits as its factorization.

21386633363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 44.

The spelling of 21386633363 in words is "twenty-one billion, three hundred eighty-six million, six hundred thirty-three thousand, three hundred sixty-three".