21326223604 has 24 divisors (see below), whose sum is σ = 42756754880. Its totient is φ = 9117458496.

The previous prime is 21326223601. The next prime is 21326223617. The reversal of 21326223604 is 40632262312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326223601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 919662 + ... + 942565.

Almost surely, 2^21326223604 is an apocalyptic number.

It is an amenable number.

21326223604 is an abundant number, since it is smaller than the sum of its proper divisors (21430531276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21326223604 is a wasteful number, since it uses less digits than its factorization.

21326223604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862647 (or 1862645 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21326223604 its reverse (40632262312), we get a palindrome (61958485916).

The spelling of 21326223604 in words is "twenty-one billion, three hundred twenty-six million, two hundred twenty-three thousand, six hundred four".