21626544404 has 6 divisors (see below), whose sum is σ = 37846452714. Its totient is φ = 10813272200.

The previous prime is 21626544391. The next prime is 21626544461. The reversal of 21626544404 is 40444562612.

It can be written as a sum of positive squares in only one way, i.e., 17619907600 + 4006636804 = 132740^2 + 63298^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2703318047 + ... + 2703318054.

It is an arithmetic number, because the mean of its divisors is an integer number (6307742119).

Almost surely, 2^21626544404 is an apocalyptic number.

It is an amenable number.

21626544404 is a deficient number, since it is larger than the sum of its proper divisors (16219908310).

21626544404 is a wasteful number, since it uses less digits than its factorization.

21626544404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406636105 (or 5406636103 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 38.

The spelling of 21626544404 in words is "twenty-one billion, six hundred twenty-six million, five hundred forty-four thousand, four hundred four".