1221325404 has 48 divisors (see below), whose sum is σ = 3073795872. Its totient is φ = 375201792.

The previous prime is 1221325397. The next prime is 1221325411. The reversal of 1221325404 is 4045231221.

It is an interprime number because it is at equal distance from previous prime (1221325397) and next prime (1221325411).

It is a congruent number.

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, 99172 + ... + 110804.

It is an arithmetic number, because the mean of its divisors is an integer number (64037414).

Almost surely, 2^1221325404 is an apocalyptic number.

It is an amenable number.

1221325404 is an abundant number, since it is smaller than the sum of its proper divisors (1852470468).

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

1221325404 is a wasteful number, since it uses less digits than its factorization.

1221325404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12326 (or 12324 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1221325404 is about 34947.4663459313. The cubic root of 1221325404 is about 1068.9165391718.

Adding to 1221325404 its reverse (4045231221), we get a palindrome (5266556625).

The spelling of 1221325404 in words is "one billion, two hundred twenty-one million, three hundred twenty-five thousand, four hundred four".