121311408 has 40 divisors (see below), whose sum is σ = 324198000. Its totient is φ = 39042304.

The previous prime is 121311349. The next prime is 121311413. The reversal of 121311408 is 804113121.

It is a happy 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, 42183 + ... + 44966.

It is an arithmetic number, because the mean of its divisors is an integer number (8104950).

Almost surely, 2^121311408 is an apocalyptic number.

It is an amenable number.

121311408 is an abundant number, since it is smaller than the sum of its proper divisors (202886592).

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

121311408 is a wasteful number, since it uses less digits than its factorization.

121311408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87189 (or 87183 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 121311408 is about 11014.1458134528. The cubic root of 121311408 is about 495.0326924638.

Adding to 121311408 its reverse (804113121), we get a palindrome (925424529).

It can be divided in two parts, 1213 and 11408, that added together give a palindrome (12621).

The spelling of 121311408 in words is "one hundred twenty-one million, three hundred eleven thousand, four hundred eight".