21523675144 has 16 divisors (see below), whose sum is σ = 40360229100. Its totient is φ = 10760947392.

The previous prime is 21523675079. The next prime is 21523675189. The reversal of 21523675144 is 44157632512.

It can be written as a sum of positive squares in 2 ways, for example, as 21392572644 + 131102500 = 146262^2 + 11450^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21523675097 and 21523675106.

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, 2227 + ... + 207490.

Almost surely, 2^21523675144 is an apocalyptic number.

It is an amenable number.

21523675144 is a deficient number, since it is larger than the sum of its proper divisors (18836553956).

21523675144 is a wasteful number, since it uses less digits than its factorization.

21523675144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222552 (or 222548 counting only the distinct ones).

The product of its digits is 201600, while the sum is 40.

The spelling of 21523675144 in words is "twenty-one billion, five hundred twenty-three million, six hundred seventy-five thousand, one hundred forty-four".