21645126235 has 32 divisors (see below), whose sum is σ = 27647659008. Its totient is φ = 16232641920.

The previous prime is 21645126163. The next prime is 21645126259. The reversal of 21645126235 is 53262154612.

It is not a de Polignac number, because 21645126235 - 2¹¹ = 21645124187 is a prime.

It is a super-2 number, since 2×21645126235² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21645126194 and 21645126203.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1979794 + ... + 1990696.

It is an arithmetic number, because the mean of its divisors is an integer number (863989344).

Almost surely, 2^21645126235 is an apocalyptic number.

21645126235 is a deficient number, since it is larger than the sum of its proper divisors (6002532773).

21645126235 is a wasteful number, since it uses less digits than its factorization.

21645126235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11275.

The product of its digits is 86400, while the sum is 37.

The spelling of 21645126235 in words is "twenty-one billion, six hundred forty-five million, one hundred twenty-six thousand, two hundred thirty-five".