121721204 has 24 divisors (see below), whose sum is σ = 232964256. Its totient is φ = 55188000.

The previous prime is 121721203. The next prime is 121721209. The reversal of 121721204 is 402127121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121721203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15239 + ... + 21809.

It is an arithmetic number, because the mean of its divisors is an integer number (9706844).

Almost surely, 2^121721204 is an apocalyptic number.

It is an amenable number.

121721204 is a deficient number, since it is larger than the sum of its proper divisors (111243052).

121721204 is a wasteful number, since it uses less digits than its factorization.

121721204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007 (or 7005 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 121721204 is about 11032.7332968762. The cubic root of 121721204 is about 495.5894810402.

Adding to 121721204 its reverse (402127121), we get a palindrome (523848325).

The spelling of 121721204 in words is "one hundred twenty-one million, seven hundred twenty-one thousand, two hundred four".