121021129 has 4 divisors (see below), whose sum is σ = 122219460. Its totient is φ = 119822800.

The previous prime is 121021111. The next prime is 121021151. The reversal of 121021129 is 921120121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52925625 + 68095504 = 7275^2 + 8252^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021129 - 2⁵ = 121021097 is a prime.

It is a super-3 number, since 3×121021129³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121021169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 599014 + ... + 599215.

It is an arithmetic number, because the mean of its divisors is an integer number (30554865).

Almost surely, 2^121021129 is an apocalyptic number.

It is an amenable number.

121021129 is a deficient number, since it is larger than the sum of its proper divisors (1198331).

121021129 is a wasteful number, since it uses less digits than its factorization.

121021129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198330.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 121021129 is about 11000.9603671680. The cubic root of 121021129 is about 494.6375321484.

It can be divided in two parts, 12102 and 1129, that added together give a palindrome (13231).

The spelling of 121021129 in words is "one hundred twenty-one million, twenty-one thousand, one hundred twenty-nine".