72121044 has 12 divisors (see below), whose sum is σ = 168282464. Its totient is φ = 24040344.

The previous prime is 72121043. The next prime is 72121067. The reversal of 72121044 is 44012127.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 72121044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72121043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3005032 + ... + 3005055.

Almost surely, 2^72121044 is an apocalyptic number.

It is an amenable number.

72121044 is an abundant number, since it is smaller than the sum of its proper divisors (96161420).

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

72121044 is a wasteful number, since it uses less digits than its factorization.

72121044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6010094 (or 6010092 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 72121044 is about 8492.4109650911. The cubic root of 72121044 is about 416.2497652606.

It can be divided in two parts, 7212 and 1044, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 72121044 in words is "seventy-two million, one hundred twenty-one thousand, forty-four".