21415453000 has 128 divisors (see below), whose sum is σ = 51105880800. Its totient is φ = 8397312000.

The previous prime is 21415452991. The next prime is 21415453021. The reversal of 21415453000 is 35451412.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 15275476836 + 6139976164 = 123594^2 + 78358^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34708692 + ... + 34709308.

Almost surely, 2^21415453000 is an apocalyptic number.

21415453000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21415453000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25552940400).

21415453000 is an abundant number, since it is smaller than the sum of its proper divisors (29690427800).

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

21415453000 is a wasteful number, since it uses less digits than its factorization.

21415453000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 21415453000 in words is "twenty-one billion, four hundred fifteen million, four hundred fifty-three thousand".