621220115 has 4 divisors (see below), whose sum is σ = 745464144. Its totient is φ = 496976088.

The previous prime is 621220063. The next prime is 621220139. The reversal of 621220115 is 511022126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621220115 - 2¹² = 621216019 is a prime.

It is a super-2 number, since 2×621220115² = 771828862561226450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62122007 + ... + 62122016.

It is an arithmetic number, because the mean of its divisors is an integer number (186366036).

Almost surely, 2^621220115 is an apocalyptic number.

621220115 is a deficient number, since it is larger than the sum of its proper divisors (124244029).

621220115 is a wasteful number, since it uses less digits than its factorization.

621220115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124244028.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 621220115 is about 24924.2876528097. The cubic root of 621220115 is about 853.2608836229.

The spelling of 621220115 in words is "six hundred twenty-one million, two hundred twenty thousand, one hundred fifteen".