21457300000 has 144 divisors (see below), whose sum is σ = 53088867720. Its totient is φ = 8536320000.

The previous prime is 21457299979. The next prime is 21457300019. The reversal of 21457300000 is 375412.

It can be written as a sum of positive squares in 12 ways, for example, as 10274660496 + 11182639504 = 101364^2 + 105748^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22899532 + ... + 22900468.

Almost surely, 2^21457300000 is an apocalyptic number.

21457300000 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 21457300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26544433860).

21457300000 is an abundant number, since it is smaller than the sum of its proper divisors (31631567720).

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

21457300000 is an frugal number, since it uses more digits than its factorization.

21457300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201 (or 1173 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

Adding to 21457300000 its reverse (375412), we get a palindrome (21457675412).

The spelling of 21457300000 in words is "twenty-one billion, four hundred fifty-seven million, three hundred thousand".