104221551 has 32 divisors (see below), whose sum is σ = 163575808. Its totient is φ = 57788640.

The previous prime is 104221519. The next prime is 104221567. The reversal of 104221551 is 155122401.

It is not a de Polignac number, because 104221551 - 2⁵ = 104221519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104221511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190260 + ... + 190806.

It is an arithmetic number, because the mean of its divisors is an integer number (5111744).

Almost surely, 2^104221551 is an apocalyptic number.

104221551 is a deficient number, since it is larger than the sum of its proper divisors (59354257).

104221551 is a wasteful number, since it uses less digits than its factorization.

104221551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 104221551 is about 10208.8956797491. The cubic root of 104221551 is about 470.6006369474.

Adding to 104221551 its reverse (155122401), we get a palindrome (259343952).

The spelling of 104221551 in words is "one hundred four million, two hundred twenty-one thousand, five hundred fifty-one".