105621002155 has 16 divisors (see below), whose sum is σ = 135069825024. Its totient is φ = 79103384800.

The previous prime is 105621002119. The next prime is 105621002219. The reversal of 105621002155 is 551200126501.

It is not a de Polignac number, because 105621002155 - 2⁷ = 105621002027 is a prime.

It is a super-2 number, since 2×105621002155² (a number of 23 digits) contains 22 as substring.

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, 9765271 + ... + 9776080.

It is an arithmetic number, because the mean of its divisors is an integer number (8441864064).

Almost surely, 2^105621002155 is an apocalyptic number.

105621002155 is a deficient number, since it is larger than the sum of its proper divisors (29448822869).

105621002155 is a wasteful number, since it uses less digits than its factorization.

105621002155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19541426.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 105621002155 its reverse (551200126501), we get a palindrome (656821128656).

The spelling of 105621002155 in words is "one hundred five billion, six hundred twenty-one million, two thousand, one hundred fifty-five".