1213421136 has 40 divisors (see below), whose sum is σ = 3163443360. Its totient is φ = 400761216.

The previous prime is 1213421123. The next prime is 1213421141. The reversal of 1213421136 is 6311243121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110730 + ... + 121193.

It is an arithmetic number, because the mean of its divisors is an integer number (79086084).

Almost surely, 2^1213421136 is an apocalyptic number.

1213421136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1213421136 is an abundant number, since it is smaller than the sum of its proper divisors (1950022224).

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

1213421136 is a wasteful number, since it uses less digits than its factorization.

1213421136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232043 (or 232037 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 1213421136 is about 34834.1949239537. The cubic root of 1213421136 is about 1066.6055810504.

Adding to 1213421136 its reverse (6311243121), we get a palindrome (7524664257).

The spelling of 1213421136 in words is "one billion, two hundred thirteen million, four hundred twenty-one thousand, one hundred thirty-six".