21223374757 has 4 divisors (see below), whose sum is σ = 22855942060. Its totient is φ = 19590807456.

The previous prime is 21223374671. The next prime is 21223374763. The reversal of 21223374757 is 75747332212.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5326956196 + 15896418561 = 72986^2 + 126081^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223374757 - 2¹⁵ = 21223341989 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 (21223374157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816283632 + ... + 816283657.

It is an arithmetic number, because the mean of its divisors is an integer number (5713985515).

Almost surely, 2^21223374757 is an apocalyptic number.

It is an amenable number.

21223374757 is a deficient number, since it is larger than the sum of its proper divisors (1632567303).

21223374757 is a wasteful number, since it uses less digits than its factorization.

21223374757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632567302.

The product of its digits is 493920, while the sum is 43.

The spelling of 21223374757 in words is "twenty-one billion, two hundred twenty-three million, three hundred seventy-four thousand, seven hundred fifty-seven".