121644012 has 48 divisors (see below), whose sum is σ = 333159680. Its totient is φ = 33815232.

The previous prime is 121644001. The next prime is 121644013. The reversal of 121644012 is 210446121.

It is a happy number.

It is a super-2 number, since 2×121644012² = 29594531310912288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 121644012.

It is not an unprimeable number, because it can be changed into a prime (121644013) 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, 16462 + ... + 22677.

Almost surely, 2^121644012 is an apocalyptic number.

121644012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121644012 is an abundant number, since it is smaller than the sum of its proper divisors (211515668).

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

121644012 is a wasteful number, since it uses less digits than its factorization.

121644012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39190 (or 39188 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 121644012 is about 11029.2344249272. The cubic root of 121644012 is about 495.4846961393.

The spelling of 121644012 in words is "one hundred twenty-one million, six hundred forty-four thousand, twelve".