21485825490 has 16 divisors (see below), whose sum is σ = 51565981248. Its totient is φ = 5729553456.

The previous prime is 21485825483. The next prime is 21485825497. The reversal of 21485825490 is 9452858412.

It is an interprime number because it is at equal distance from previous prime (21485825483) and next prime (21485825497).

It is not an unprimeable number, because it can be changed into a prime (21485825497) 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, 358097062 + ... + 358097121.

It is an arithmetic number, because the mean of its divisors is an integer number (3222873828).

Almost surely, 2^21485825490 is an apocalyptic number.

21485825490 is an abundant number, since it is smaller than the sum of its proper divisors (30080155758).

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

21485825490 is a wasteful number, since it uses less digits than its factorization.

21485825490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716194193.

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 21485825490 in words is "twenty-one billion, four hundred eighty-five million, eight hundred twenty-five thousand, four hundred ninety".