21490066000 has 80 divisors (see below), whose sum is σ = 55960199568. Its totient is φ = 7934784000.

The previous prime is 21490065997. The next prime is 21490066051. The reversal of 21490066000 is 66009412.

It can be written as a sum of positive squares in 8 ways, for example, as 11670048784 + 9820017216 = 108028^2 + 99096^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 21490066000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387271 + ... + 439270.

Almost surely, 2^21490066000 is an apocalyptic number.

21490066000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21490066000 is an abundant number, since it is smaller than the sum of its proper divisors (34470133568).

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

21490066000 is a wasteful number, since it uses less digits than its factorization.

21490066000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826577 (or 826561 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

It can be divided in two parts, 214900 and 66000, that added together give a square (280900 = 530²).

The spelling of 21490066000 in words is "twenty-one billion, four hundred ninety million, sixty-six thousand".