121421356 has 24 divisors (see below), whose sum is σ = 243192096. Its totient is φ = 51962880.

The previous prime is 121421329. The next prime is 121421369. The reversal of 121421356 is 653124121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121421356.

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, 19596 + ... + 25036.

It is an arithmetic number, because the mean of its divisors is an integer number (10133004).

Almost surely, 2^121421356 is an apocalyptic number.

It is an amenable number.

121421356 is an abundant number, since it is smaller than the sum of its proper divisors (121770740).

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

121421356 is a wasteful number, since it uses less digits than its factorization.

121421356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249 (or 6247 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 121421356 is about 11019.1359007864. The cubic root of 121421356 is about 495.1822014024.

Adding to 121421356 its reverse (653124121), we get a palindrome (774545477).

The spelling of 121421356 in words is "one hundred twenty-one million, four hundred twenty-one thousand, three hundred fifty-six".