21224032520220 has 36 divisors (see below), whose sum is σ = 64379565311880. Its totient is φ = 5659742005344.

The previous prime is 21224032520203. The next prime is 21224032520221. The reversal of 21224032520220 is 2202523042212.

It is a happy number.

21224032520220 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 403 + 252 + 0 + 2 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21224032520220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224032520221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58955645710 + ... + 58955646069.

Almost surely, 2^{21224032520220} is an apocalyptic number.

21224032520220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21224032520220 is an abundant number, since it is smaller than the sum of its proper divisors (43155532791660).

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

21224032520220 is a wasteful number, since it uses less digits than its factorization.

21224032520220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117911291794 (or 117911291789 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 21224032520220 its reverse (2202523042212), we get a palindrome (23426555562432).

The spelling of 21224032520220 in words is "twenty-one trillion, two hundred twenty-four billion, thirty-two million, five hundred twenty thousand, two hundred twenty".