21770757938 has 8 divisors (see below), whose sum is σ = 32774029932. Its totient is φ = 10846081296.

The previous prime is 21770757937. The next prime is 21770758001. The reversal of 21770757938 is 83975707712.

It can be written as a sum of positive squares in 2 ways, for example, as 15857609329 + 5913148609 = 125927^2 + 76897^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21770757937) 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, 19648145 + ... + 19649252.

Almost surely, 2^21770757938 is an apocalyptic number.

21770757938 is a deficient number, since it is larger than the sum of its proper divisors (11003271994).

21770757938 is a wasteful number, since it uses less digits than its factorization.

21770757938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39297676.

The product of its (nonzero) digits is 5186160, while the sum is 56.

The spelling of 21770757938 in words is "twenty-one billion, seven hundred seventy million, seven hundred fifty-seven thousand, nine hundred thirty-eight".