1304100021 has 16 divisors (see below), whose sum is σ = 1993107584. Its totient is φ = 742984704.

The previous prime is 1304099999. The next prime is 1304100037. The reversal of 1304100021 is 1200014031.

It is a happy number.

It is not a de Polignac number, because 1304100021 - 2⁵ = 1304099989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304100071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85060 + ... + 99213.

It is an arithmetic number, because the mean of its divisors is an integer number (124569224).

Almost surely, 2^1304100021 is an apocalyptic number.

It is an amenable number.

1304100021 is a deficient number, since it is larger than the sum of its proper divisors (689007563).

1304100021 is a wasteful number, since it uses less digits than its factorization.

1304100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184620.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1304100021 is about 36112.3250566894. The cubic root of 1304100021 is about 1092.5390465826.

Adding to 1304100021 its reverse (1200014031), we get a palindrome (2504114052).

The spelling of 1304100021 in words is "one billion, three hundred four million, one hundred thousand, twenty-one".