121421144 has 64 divisors (see below), whose sum is σ = 256435200. Its totient is φ = 53512704.

The previous prime is 121421137. The next prime is 121421159. The reversal of 121421144 is 441124121.

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 15 ways as a sum of consecutive naturals, for example, 382874 + ... + 383190.

It is an arithmetic number, because the mean of its divisors is an integer number (4006800).

Almost surely, 2^121421144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121421144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128217600).

121421144 is an abundant number, since it is smaller than the sum of its proper divisors (135014056).

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

121421144 is a wasteful number, since it uses less digits than its factorization.

121421144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 488 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

The square root of 121421144 is about 11019.1262811531. The cubic root of 121421144 is about 495.1819132085.

Adding to 121421144 its reverse (441124121), we get a palindrome (562545265).

The spelling of 121421144 in words is "one hundred twenty-one million, four hundred twenty-one thousand, one hundred forty-four".