21224252150424 has 24 divisors (see below), whose sum is σ = 57482349574260. Its totient is φ = 7074750716784.

The previous prime is 21224252150393. The next prime is 21224252150531. The reversal of 21224252150424 is 42405125242212.

21224252150424 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 42 + 521 + 50 + 42 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147390639862 + ... + 147390640005.

Almost surely, 2^{21224252150424} is an apocalyptic number.

21224252150424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21224252150424 is an abundant number, since it is smaller than the sum of its proper divisors (36258097423836).

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

21224252150424 is a wasteful number, since it uses less digits than its factorization.

21224252150424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294781279879 (or 294781279872 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 36.

Adding to 21224252150424 its reverse (42405125242212), we get a palindrome (63629377392636).

The spelling of 21224252150424 in words is "twenty-one trillion, two hundred twenty-four billion, two hundred fifty-two million, one hundred fifty thousand, four hundred twenty-four".