21490945488 has 80 divisors (see below), whose sum is σ = 65315640960. Its totient is φ = 6742255104.

The previous prime is 21490945477. The next prime is 21490945507. The reversal of 21490945488 is 88454909412.

It is a happy number.

21490945488 is a `hidden beast` number, since 2 + 1 + 4 + 9 + 0 + 94 + 548 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1455820 + ... + 1470507.

It is an arithmetic number, because the mean of its divisors is an integer number (816445512).

Almost surely, 2^21490945488 is an apocalyptic number.

It is an amenable number.

21490945488 is an abundant number, since it is smaller than the sum of its proper divisors (43824695472).

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

21490945488 is a wasteful number, since it uses less digits than its factorization.

21490945488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926361 (or 2926349 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 21490945488 in words is "twenty-one billion, four hundred ninety million, nine hundred forty-five thousand, four hundred eighty-eight".