21024636132420 has 144 divisors (see below), whose sum is σ = 63931138427520. Its totient is φ = 5592836325888.

The previous prime is 21024636132413. The next prime is 21024636132431. The reversal of 21024636132420 is 2423163642012.

21024636132420 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 4 + 636 + 13 + 2 + 4 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120340449 + ... + 120515031.

It is an arithmetic number, because the mean of its divisors is an integer number (443966239080).

Almost surely, 2^{21024636132420} is an apocalyptic number.

21024636132420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21024636132420 is an abundant number, since it is smaller than the sum of its proper divisors (42906502295100).

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

21024636132420 is a wasteful number, since it uses less digits than its factorization.

21024636132420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176234 (or 176229 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 21024636132420 its reverse (2423163642012), we get a palindrome (23447799774432).

The spelling of 21024636132420 in words is "twenty-one trillion, twenty-four billion, six hundred thirty-six million, one hundred thirty-two thousand, four hundred twenty".