21156880022 has 4 divisors (see below), whose sum is σ = 31735320036. Its totient is φ = 10578440010.

The previous prime is 21156880013. The next prime is 21156880037. The reversal of 21156880022 is 22008865112.

It is a happy number.

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

It is a super-2 number, since 2×21156880022² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5289220004 + ... + 5289220007.

It is an arithmetic number, because the mean of its divisors is an integer number (7933830009).

Almost surely, 2^21156880022 is an apocalyptic number.

21156880022 is a deficient number, since it is larger than the sum of its proper divisors (10578440014).

21156880022 is a wasteful number, since it uses less digits than its factorization.

21156880022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10578440013.

The product of its (nonzero) digits is 15360, while the sum is 35.

The spelling of 21156880022 in words is "twenty-one billion, one hundred fifty-six million, eight hundred eighty thousand, twenty-two".