21453020530000 has 50 divisors (see below), whose sum is σ = 51939908029394. Its totient is φ = 8581208208000.

The previous prime is 21453020529949. The next prime is 21453020530061. The reversal of 21453020530000 is 3502035412.

It can be written as a sum of positive squares in 5 ways, for example, as 2123210351376 + 19329810178624 = 1457124^2 + 4396568^2 .

It is a tau number, because it is divible by the number of its divisors (50).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1072641027 + ... + 1072661026.

Almost surely, 2^{21453020530000} is an apocalyptic number.

21453020530000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21453020530000 is an abundant number, since it is smaller than the sum of its proper divisors (30486887499394).

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

21453020530000 is an equidigital number, since it uses as much as digits as its factorization.

21453020530000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145302081 (or 2145302060 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21453020530000 its reverse (3502035412), we get a palindrome (21456522565412).

The spelling of 21453020530000 in words is "twenty-one trillion, four hundred fifty-three billion, twenty million, five hundred thirty thousand".