21492589400 has 24 divisors (see below), whose sum is σ = 49970270820. Its totient is φ = 8597035680.

The previous prime is 21492589381. The next prime is 21492589403. The reversal of 21492589400 is 498529412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492589403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53731274 + ... + 53731673.

Almost surely, 2^21492589400 is an apocalyptic number.

21492589400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21492589400 is an abundant number, since it is smaller than the sum of its proper divisors (28477681420).

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

21492589400 is a wasteful number, since it uses less digits than its factorization.

21492589400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107462963 (or 107462954 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 21492589400 in words is "twenty-one billion, four hundred ninety-two million, five hundred eighty-nine thousand, four hundred".