21970035247 has 2 divisors, whose sum is σ = 21970035248. Its totient is φ = 21970035246.

The previous prime is 21970035211. The next prime is 21970035253. The reversal of 21970035247 is 74253007912.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21970035247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21970035257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10985017623 + 10985017624.

It is an arithmetic number, because the mean of its divisors is an integer number (10985017624).

Almost surely, 2^21970035247 is an apocalyptic number.

21970035247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21970035247 is an equidigital number, since it uses as much as digits as its factorization.

21970035247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 21970035247 in words is "twenty-one billion, nine hundred seventy million, thirty-five thousand, two hundred forty-seven".