21367224757 has 16 divisors (see below), whose sum is σ = 22395049200. Its totient is φ = 20366940672.

The previous prime is 21367224727. The next prime is 21367224797. The reversal of 21367224757 is 75742276312.

It can be written as a sum of positive squares in 8 ways, for example, as 697699396 + 20669525361 = 26414^2 + 143769^2 .

It is not a de Polignac number, because 21367224757 - 2⁷ = 21367224629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367224727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375903 + ... + 428995.

It is an arithmetic number, because the mean of its divisors is an integer number (1399690575).

Almost surely, 2^21367224757 is an apocalyptic number.

It is an amenable number.

21367224757 is a deficient number, since it is larger than the sum of its proper divisors (1027824443).

21367224757 is a wasteful number, since it uses less digits than its factorization.

21367224757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53352.

The product of its digits is 987840, while the sum is 46.

The spelling of 21367224757 in words is "twenty-one billion, three hundred sixty-seven million, two hundred twenty-four thousand, seven hundred fifty-seven".