21338522945 has 16 divisors (see below), whose sum is σ = 26966701440. Its totient is φ = 16164687744.

The previous prime is 21338522873. The next prime is 21338522957. The reversal of 21338522945 is 54922583312.

It is a cyclic number.

It is not a de Polignac number, because 21338522945 - 2¹⁰ = 21338521921 is a prime.

It is a super-2 number, since 2×21338522945² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21338522896 and 21338522905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152372 + ... + 256698.

It is an arithmetic number, because the mean of its divisors is an integer number (1685418840).

Almost surely, 2^21338522945 is an apocalyptic number.

It is an amenable number.

21338522945 is a deficient number, since it is larger than the sum of its proper divisors (5628178495).

21338522945 is a wasteful number, since it uses less digits than its factorization.

21338522945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106504.

The product of its digits is 518400, while the sum is 44.

The spelling of 21338522945 in words is "twenty-one billion, three hundred thirty-eight million, five hundred twenty-two thousand, nine hundred forty-five".