121389279 has 16 divisors (see below), whose sum is σ = 177550464. Its totient is φ = 73159200.

The previous prime is 121389277. The next prime is 121389283. The reversal of 121389279 is 972983121.

It is not a de Polignac number, because 121389279 - 2¹ = 121389277 is a prime.

It is a super-2 number, since 2×121389279² = 29470714112279682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121389279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121389277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4189 + ... + 16134.

It is an arithmetic number, because the mean of its divisors is an integer number (11096904).

Almost surely, 2^121389279 is an apocalyptic number.

121389279 is a deficient number, since it is larger than the sum of its proper divisors (56161185).

121389279 is a wasteful number, since it uses less digits than its factorization.

121389279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20518.

The product of its digits is 54432, while the sum is 42.

The square root of 121389279 is about 11017.6802912410. The cubic root of 121389279 is about 495.1385919449.

The spelling of 121389279 in words is "one hundred twenty-one million, three hundred eighty-nine thousand, two hundred seventy-nine".