21152520052220 has 48 divisors (see below), whose sum is σ = 46358681564160. Its totient is φ = 8096954858496.

The previous prime is 21152520052207. The next prime is 21152520052267. The reversal of 21152520052220 is 2225002525112.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161305532 + ... + 161436611.

It is an arithmetic number, because the mean of its divisors is an integer number (965805865920).

Almost surely, 2^{21152520052220} is an apocalyptic number.

21152520052220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152520052220 is an abundant number, since it is smaller than the sum of its proper divisors (25206161511940).

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

21152520052220 is a wasteful number, since it uses less digits than its factorization.

21152520052220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322742294 (or 322742292 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 21152520052220 its reverse (2225002525112), we get a palindrome (23377522577332).

The spelling of 21152520052220 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred twenty million, fifty-two thousand, two hundred twenty".