21124515432402 has 48 divisors (see below), whose sum is σ = 45960813138240. Its totient is φ = 7012135776096.

The previous prime is 21124515432389. The next prime is 21124515432403. The reversal of 21124515432402 is 20423451542112.

21124515432402 is a `hidden beast` number, since 2 + 1 + 1 + 24 + 51 + 543 + 2 + 40 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21124515432403) 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, 11990724 + ... + 13639152.

It is an arithmetic number, because the mean of its divisors is an integer number (957516940380).

Almost surely, 2^{21124515432402} is an apocalyptic number.

21124515432402 is an abundant number, since it is smaller than the sum of its proper divisors (24836297705838).

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

21124515432402 is a wasteful number, since it uses less digits than its factorization.

21124515432402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651407 (or 1651404 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

Adding to 21124515432402 its reverse (20423451542112), we get a palindrome (41547966974514).

The spelling of 21124515432402 in words is "twenty-one trillion, one hundred twenty-four billion, five hundred fifteen million, four hundred thirty-two thousand, four hundred two".