121213789 has 4 divisors (see below), whose sum is σ = 123268320. Its totient is φ = 119159260.

The previous prime is 121213759. The next prime is 121213801. The reversal of 121213789 is 987312121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121213789 - 2⁹ = 121213277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213759) 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, 1027177 + ... + 1027294.

It is an arithmetic number, because the mean of its divisors is an integer number (30817080).

Almost surely, 2^121213789 is an apocalyptic number.

It is an amenable number.

121213789 is a deficient number, since it is larger than the sum of its proper divisors (2054531).

121213789 is an equidigital number, since it uses as much as digits as its factorization.

121213789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054530.

The product of its digits is 6048, while the sum is 34.

The square root of 121213789 is about 11009.7133931815. The cubic root of 121213789 is about 494.8998729562.

The spelling of 121213789 in words is "one hundred twenty-one million, two hundred thirteen thousand, seven hundred eighty-nine".