121530902 has 4 divisors (see below), whose sum is σ = 182296356. Its totient is φ = 60765450.

The previous prime is 121530887. The next prime is 121530907. The reversal of 121530902 is 209035121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 209035121 = 479 ⋅436399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121530907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30382724 + ... + 30382727.

It is an arithmetic number, because the mean of its divisors is an integer number (45574089).

Almost surely, 2^121530902 is an apocalyptic number.

121530902 is a deficient number, since it is larger than the sum of its proper divisors (60765454).

121530902 is an equidigital number, since it uses as much as digits as its factorization.

121530902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60765453.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 121530902 is about 11024.1054965925. The cubic root of 121530902 is about 495.3310739624.

The spelling of 121530902 in words is "one hundred twenty-one million, five hundred thirty thousand, nine hundred two".