121209012 has 18 divisors (see below), whose sum is σ = 306389538. Its totient is φ = 40402992.

The previous prime is 121209007. The next prime is 121209041. The reversal of 121209012 is 210902121.

It can be written as a sum of positive squares in only one way, i.e., 99920016 + 21288996 = 9996^2 + 4614^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×121209012² = 29383249180032288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1683423 + ... + 1683494.

It is an arithmetic number, because the mean of its divisors is an integer number (17021641).

Almost surely, 2^121209012 is an apocalyptic number.

121209012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121209012 is an abundant number, since it is smaller than the sum of its proper divisors (185180526).

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

121209012 is a wasteful number, since it uses less digits than its factorization.

121209012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366927 (or 3366922 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 121209012 is about 11009.4964462504. The cubic root of 121209012 is about 494.8933715843.

The spelling of 121209012 in words is "one hundred twenty-one million, two hundred nine thousand, twelve".