21489266400 has 144 divisors (see below), whose sum is σ = 79940133504. Its totient is φ = 4911828480.

The previous prime is 21489266369. The next prime is 21489266401. The reversal of 21489266400 is 466298412.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21489266401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 622762 + ... + 656361.

It is an arithmetic number, because the mean of its divisors is an integer number (555139816).

Almost surely, 2^21489266400 is an apocalyptic number.

21489266400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21489266400 is an abundant number, since it is smaller than the sum of its proper divisors (58450867104).

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

21489266400 is a wasteful number, since it uses less digits than its factorization.

21489266400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279153 (or 1279140 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 21489266400 in words is "twenty-one billion, four hundred eighty-nine million, two hundred sixty-six thousand, four hundred".