1321423100 has 36 divisors (see below), whose sum is σ = 2878128288. Its totient is φ = 526608000.

The previous prime is 1321423093. The next prime is 1321423109. The reversal of 1321423100 is 13241231.

It is a super-2 number, since 2×1321423100² = 3492318018427220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321423109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2720 + ... + 51480.

It is an arithmetic number, because the mean of its divisors is an integer number (79948008).

Almost surely, 2^1321423100 is an apocalyptic number.

1321423100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321423100 is an abundant number, since it is smaller than the sum of its proper divisors (1556705188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321423100 is a wasteful number, since it uses less digits than its factorization.

1321423100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49046 (or 49039 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1321423100 is about 36351.3837425757. The cubic root of 1321423100 is about 1097.3553824490.

Adding to 1321423100 its reverse (13241231), we get a palindrome (1334664331).

The spelling of 1321423100 in words is "one billion, three hundred twenty-one million, four hundred twenty-three thousand, one hundred".