12921090 has 64 divisors (see below), whose sum is σ = 38174976. Its totient is φ = 2725632.

The previous prime is 12921089. The next prime is 12921091. The reversal of 12921090 is 9012921.

It is an interprime number because it is at equal distance from previous prime (12921089) and next prime (12921091).

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12921090.

It is not an unprimeable number, because it can be changed into a prime (12921091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 364 + ... + 5096.

It is an arithmetic number, because the mean of its divisors is an integer number (596484).

Almost surely, 2^12921090 is an apocalyptic number.

12921090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12921090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19087488).

12921090 is an abundant number, since it is smaller than the sum of its proper divisors (25253886).

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

12921090 is a wasteful number, since it uses less digits than its factorization.

12921090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4763.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 12921090 is about 3594.5917709804. The cubic root of 12921090 is about 234.6567495199.

The spelling of 12921090 in words is "twelve million, nine hundred twenty-one thousand, ninety".