21770757943 has 4 divisors (see below), whose sum is σ = 23749917768. Its totient is φ = 19791598120.

The previous prime is 21770757937. The next prime is 21770758001. The reversal of 21770757943 is 34975707712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21770757943 - 2³³ = 13180823351 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 (21770757143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989579896 + ... + 989579917.

It is an arithmetic number, because the mean of its divisors is an integer number (5937479442).

Almost surely, 2^21770757943 is an apocalyptic number.

21770757943 is a deficient number, since it is larger than the sum of its proper divisors (1979159825).

21770757943 is a wasteful number, since it uses less digits than its factorization.

21770757943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979159824.

The product of its (nonzero) digits is 2593080, while the sum is 52.

The spelling of 21770757943 in words is "twenty-one billion, seven hundred seventy million, seven hundred fifty-seven thousand, nine hundred forty-three".