21904219440 has 60 divisors (see below), whose sum is σ = 73561672704. Its totient is φ = 5841124992.

The previous prime is 21904219433. The next prime is 21904219451. The reversal of 21904219440 is 4491240912.

21904219440 is a `hidden beast` number, since 2 + 190 + 4 + 21 + 9 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21904219395 and 21904219404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15210544 + ... + 15211983.

Almost surely, 2^21904219440 is an apocalyptic number.

21904219440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21904219440 is an abundant number, since it is smaller than the sum of its proper divisors (51657453264).

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

21904219440 is a wasteful number, since it uses less digits than its factorization.

21904219440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30422546 (or 30422537 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21904219440 in words is "twenty-one billion, nine hundred four million, two hundred nineteen thousand, four hundred forty".