252221511551420 has 24 divisors (see below), whose sum is σ = 529666330347504. Its totient is φ = 100888384413056.

The previous prime is 252221511551413. The next prime is 252221511551431. The reversal of 252221511551420 is 24155115122252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4209089 + ... + 22850808.

It is an arithmetic number, because the mean of its divisors is an integer number (22069430431146).

Almost surely, 2^{252221511551420} is an apocalyptic number.

252221511551420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

252221511551420 is an abundant number, since it is smaller than the sum of its proper divisors (277444818796084).

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

252221511551420 is a wasteful number, since it uses less digits than its factorization.

252221511551420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27525949 (or 27525947 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 38.

Adding to 252221511551420 its reverse (24155115122252), we get a palindrome (276376626673672).

The spelling of 252221511551420 in words is "two hundred fifty-two trillion, two hundred twenty-one billion, five hundred eleven million, five hundred fifty-one thousand, four hundred twenty".