100551421 has 4 divisors (see below), whose sum is σ = 100620000. Its totient is φ = 100482844.

The previous prime is 100551397. The next prime is 100551433. The reversal of 100551421 is 124155001.

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 not a de Polignac number, because 100551421 - 2⁷ = 100551293 is a prime.

It is a super-2 number, since 2×100551421² = 20221176530238482, 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 (100551491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32041 + ... + 35038.

It is an arithmetic number, because the mean of its divisors is an integer number (25155000).

Almost surely, 2^100551421 is an apocalyptic number.

It is an amenable number.

100551421 is a deficient number, since it is larger than the sum of its proper divisors (68579).

100551421 is an equidigital number, since it uses as much as digits as its factorization.

100551421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68578.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 100551421 is about 10027.5331462928. The cubic root of 100551421 is about 465.0104765050.

It can be divided in two parts, 10055 and 1421, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 100551421 in words is "one hundred million, five hundred fifty-one thousand, four hundred twenty-one".