21119564971 has 2 divisors, whose sum is σ = 21119564972. Its totient is φ = 21119564970.

The previous prime is 21119564951. The next prime is 21119564989. The reversal of 21119564971 is 17946591112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21119564971 - 2²³ = 21111176363 is a prime.

It is not a weakly prime, because it can be changed into another prime (21119564951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10559782485 + 10559782486.

It is an arithmetic number, because the mean of its divisors is an integer number (10559782486).

Almost surely, 2^21119564971 is an apocalyptic number.

21119564971 is a deficient number, since it is larger than the sum of its proper divisors (1).

21119564971 is an equidigital number, since it uses as much as digits as its factorization.

21119564971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 46.

The spelling of 21119564971 in words is "twenty-one billion, one hundred nineteen million, five hundred sixty-four thousand, nine hundred seventy-one".