21911496145 has 24 divisors (see below), whose sum is σ = 33030228672. Its totient is φ = 13659111840.

The previous prime is 21911496143. The next prime is 21911496151. The reversal of 21911496145 is 54169411912.

It is a happy number.

It is not a de Polignac number, because 21911496145 - 2¹ = 21911496143 is a prime.

It is a super-2 number, since 2×21911496145² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21911496143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2582719 + ... + 2591188.

It is an arithmetic number, because the mean of its divisors is an integer number (1376259528).

Almost surely, 2^21911496145 is an apocalyptic number.

It is an amenable number.

21911496145 is a deficient number, since it is larger than the sum of its proper divisors (11118732527).

21911496145 is a wasteful number, since it uses less digits than its factorization.

21911496145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5173941 (or 5173930 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

The spelling of 21911496145 in words is "twenty-one billion, nine hundred eleven million, four hundred ninety-six thousand, one hundred forty-five".