21386633371 has 2 divisors, whose sum is σ = 21386633372. Its totient is φ = 21386633370.

The previous prime is 21386633363. The next prime is 21386633399. The reversal of 21386633371 is 17333668312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21386633371 - 2³ = 21386633363 is a prime.

It is not a weakly prime, because it can be changed into another prime (21386633171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10693316685 + 10693316686.

It is an arithmetic number, because the mean of its divisors is an integer number (10693316686).

Almost surely, 2^21386633371 is an apocalyptic number.

21386633371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21386633371 is an equidigital number, since it uses as much as digits as its factorization.

21386633371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 43.

The spelling of 21386633371 in words is "twenty-one billion, three hundred eighty-six million, six hundred thirty-three thousand, three hundred seventy-one".