12921072 has 20 divisors (see below), whose sum is σ = 33379560. Its totient is φ = 4307008.

The previous prime is 12921061. The next prime is 12921089. The reversal of 12921072 is 27012921.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134547 + ... + 134642.

It is an arithmetic number, because the mean of its divisors is an integer number (1668978).

Almost surely, 2^12921072 is an apocalyptic number.

12921072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12921072 is an abundant number, since it is smaller than the sum of its proper divisors (20458488).

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

12921072 is a wasteful number, since it uses less digits than its factorization.

12921072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269200 (or 269194 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 12921072 is about 3594.5892672182. The cubic root of 12921072 is about 234.6566405553.

Adding to 12921072 its reverse (27012921), we get a palindrome (39933993).

The spelling of 12921072 in words is "twelve million, nine hundred twenty-one thousand, seventy-two".