21423024520000 has 70 divisors (see below), whose sum is σ = 53122138425818. Its totient is φ = 8569209792000.

The previous prime is 21423024519989. The next prime is 21423024520067. The reversal of 21423024520000 is 2542032412.

It can be written as a sum of positive squares in 5 ways, for example, as 10553817784896 + 10869206735104 = 3248664^2 + 3296848^2 .

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, 267747807 + ... + 267827806.

Almost surely, 2^{21423024520000} is an apocalyptic number.

21423024520000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21423024520000 is an abundant number, since it is smaller than the sum of its proper divisors (31699113905818).

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

21423024520000 is an frugal number, since it uses more digits than its factorization.

21423024520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535575645 (or 535575620 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21423024520000 its reverse (2542032412), we get a palindrome (21425566552412).

The spelling of 21423024520000 in words is "twenty-one trillion, four hundred twenty-three billion, twenty-four million, five hundred twenty thousand".