21121660022 has 8 divisors (see below), whose sum is σ = 31715121672. Its totient is φ = 10549952800.

The previous prime is 21121659997. The next prime is 21121660033. The reversal of 21121660022 is 22006612112.

It is a happy number.

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

It is a super-2 number, since 2×21121660022² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121660022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5436179 + ... + 5440062.

It is an arithmetic number, because the mean of its divisors is an integer number (3964390209).

Almost surely, 2^21121660022 is an apocalyptic number.

21121660022 is a deficient number, since it is larger than the sum of its proper divisors (10593461650).

21121660022 is a wasteful number, since it uses less digits than its factorization.

21121660022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10877214.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 21121660022 in words is "twenty-one billion, one hundred twenty-one million, six hundred sixty thousand, twenty-two".