21962556145 has 8 divisors (see below), whose sum is σ = 26372871720. Its totient is φ = 17558175360.

The previous prime is 21962556127. The next prime is 21962556157. The reversal of 21962556145 is 54165526912.

It can be written as a sum of positive squares in 4 ways, for example, as 8338063969 + 13624492176 = 91313^2 + 116724^2 .

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

It is not a de Polignac number, because 21962556145 - 2⁵ = 21962556113 is a prime.

It is a super-2 number, since 2×21962556145² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21962556095 and 21962556104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1475550 + ... + 1490359.

It is an arithmetic number, because the mean of its divisors is an integer number (3296608965).

Almost surely, 2^21962556145 is an apocalyptic number.

It is an amenable number.

21962556145 is a deficient number, since it is larger than the sum of its proper divisors (4410315575).

21962556145 is a wasteful number, since it uses less digits than its factorization.

21962556145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967395.

The product of its digits is 648000, while the sum is 46.

The spelling of 21962556145 in words is "twenty-one billion, nine hundred sixty-two million, five hundred fifty-six thousand, one hundred forty-five".