121861236 has 144 divisors (see below), whose sum is σ = 357146496. Its totient is φ = 32126976.

The previous prime is 121861211. The next prime is 121861241. The reversal of 121861236 is 632168121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 729625 + ... + 729791.

It is an arithmetic number, because the mean of its divisors is an integer number (2480184).

Almost surely, 2^121861236 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 121861236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178573248).

121861236 is an abundant number, since it is smaller than the sum of its proper divisors (235285260).

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

121861236 is a wasteful number, since it uses less digits than its factorization.

121861236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 269 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 121861236 is about 11039.0776788643. The cubic root of 121861236 is about 495.7794555837.

The spelling of 121861236 in words is "one hundred twenty-one million, eight hundred sixty-one thousand, two hundred thirty-six".