21770757967 has 24 divisors (see below), whose sum is σ = 25485134112. Its totient is φ = 18543168000.

The previous prime is 21770757937. The next prime is 21770758001. The reversal of 21770757967 is 76975707712.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21770757967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21770757917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5519398 + ... + 5523340.

It is an arithmetic number, because the mean of its divisors is an integer number (1061880588).

Almost surely, 2^21770757967 is an apocalyptic number.

21770757967 is a deficient number, since it is larger than the sum of its proper divisors (3714376145).

21770757967 is a wasteful number, since it uses less digits than its factorization.

21770757967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639 (or 4632 counting only the distinct ones).

The product of its (nonzero) digits is 9075780, while the sum is 58.

The spelling of 21770757967 in words is "twenty-one billion, seven hundred seventy million, seven hundred fifty-seven thousand, nine hundred sixty-seven".