105155621 has 4 divisors (see below), whose sum is σ = 105177600. Its totient is φ = 105133644.

The previous prime is 105155581. The next prime is 105155639. The reversal of 105155621 is 126551501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105155621 is a prime.

It is a super-2 number, since 2×105155621² = 22115409255791282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105155681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431 + ... + 14508.

It is an arithmetic number, because the mean of its divisors is an integer number (26294400).

Almost surely, 2^105155621 is an apocalyptic number.

It is an amenable number.

105155621 is a deficient number, since it is larger than the sum of its proper divisors (21979).

105155621 is an equidigital number, since it uses as much as digits as its factorization.

105155621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21978.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 105155621 is about 10254.5414817046. The cubic root of 105155621 is about 472.0023535385.

The spelling of 105155621 in words is "one hundred five million, one hundred fifty-five thousand, six hundred twenty-one".