21747335722274 has 4 divisors (see below), whose sum is σ = 32621003583414. Its totient is φ = 10873667861136.

The previous prime is 21747335722249. The next prime is 21747335722327. The reversal of 21747335722274 is 47222753374712.

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

It can be written as a sum of positive squares in only one way, i.e., 21080099968249 + 667235754025 = 4591307^2 + 816845^2 .

It is a super-2 number, since 2×21747335722274² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5436833930567 + ... + 5436833930570.

Almost surely, 2^{21747335722274} is an apocalyptic number.

21747335722274 is a deficient number, since it is larger than the sum of its proper divisors (10873667861140).

21747335722274 is a wasteful number, since it uses less digits than its factorization.

21747335722274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10873667861139.

The product of its digits is 27659520, while the sum is 56.

The spelling of 21747335722274 in words is "twenty-one trillion, seven hundred forty-seven billion, three hundred thirty-five million, seven hundred twenty-two thousand, two hundred seventy-four".