21697970139683 has 2 divisors, whose sum is σ = 21697970139684. Its totient is φ = 21697970139682.

The previous prime is 21697970139649. The next prime is 21697970139701. The reversal of 21697970139683 is 38693107979612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21697970139683 - 2²² = 21697965945379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21697970139283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10848985069841 + 10848985069842.

It is an arithmetic number, because the mean of its divisors is an integer number (10848985069842).

Almost surely, 2^{21697970139683} is an apocalyptic number.

21697970139683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21697970139683 is an equidigital number, since it uses as much as digits as its factorization.

21697970139683 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185177664, while the sum is 71.

The spelling of 21697970139683 in words is "twenty-one trillion, six hundred ninety-seven billion, nine hundred seventy million, one hundred thirty-nine thousand, six hundred eighty-three".