121721214 has 16 divisors (see below), whose sum is σ = 243721728. Its totient is φ = 40527192.

The previous prime is 121721209. The next prime is 121721219. The reversal of 121721214 is 412127121.

It is an interprime number because it is at equal distance from previous prime (121721209) and next prime (121721219).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121721219) 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, 5742 + ... + 16625.

It is an arithmetic number, because the mean of its divisors is an integer number (15232608).

Almost surely, 2^121721214 is an apocalyptic number.

121721214 is an abundant number, since it is smaller than the sum of its proper divisors (122000514).

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

121721214 is a wasteful number, since it uses less digits than its factorization.

121721214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23279.

The product of its digits is 224, while the sum is 21.

The square root of 121721214 is about 11032.7337500730. The cubic root of 121721214 is about 495.5894946119.

Adding to 121721214 its reverse (412127121), we get a palindrome (533848335).

The spelling of 121721214 in words is "one hundred twenty-one million, seven hundred twenty-one thousand, two hundred fourteen".