21120000971 has 2 divisors, whose sum is σ = 21120000972. Its totient is φ = 21120000970.

The previous prime is 21120000961. The next prime is 21120001003. The reversal of 21120000971 is 17900002112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120000971 - 2²² = 21115806667 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120000961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560000485 + 10560000486.

It is an arithmetic number, because the mean of its divisors is an integer number (10560000486).

Almost surely, 2^21120000971 is an apocalyptic number.

21120000971 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120000971 is an equidigital number, since it uses as much as digits as its factorization.

21120000971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 23.

The spelling of 21120000971 in words is "twenty-one billion, one hundred twenty million, nine hundred seventy-one", and thus it is an aban number.