252221511551421 has 8 divisors (see below), whose sum is σ = 344497674314304. Its totient is φ = 164046511578080.

The previous prime is 252221511551413. The next prime is 252221511551431. The reversal of 252221511551421 is 124155115122252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 252221511551421 - 2³ = 252221511551413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 252221511551421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252221511551431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025290697241 + ... + 1025290697486.

It is an arithmetic number, because the mean of its divisors is an integer number (43062209289288).

Almost surely, 2^{252221511551421} is an apocalyptic number.

It is an amenable number.

252221511551421 is a deficient number, since it is larger than the sum of its proper divisors (92276162762883).

252221511551421 is a wasteful number, since it uses less digits than its factorization.

252221511551421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050581394771.

The product of its digits is 80000, while the sum is 39.

Adding to 252221511551421 its reverse (124155115122252), we get a palindrome (376376626673673).

The spelling of 252221511551421 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-one".