20121499 has 8 divisors (see below), whose sum is σ = 20717568. Its totient is φ = 19532520.

The previous prime is 20121467. The next prime is 20121533. The reversal of 20121499 is 99412102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20121499 - 2⁵ = 20121467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121799) 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 7 ways as a sum of consecutive naturals, for example, 4284 + ... + 7654.

It is an arithmetic number, because the mean of its divisors is an integer number (2589696).

Almost surely, 2^20121499 is an apocalyptic number.

20121499 is a deficient number, since it is larger than the sum of its proper divisors (596069).

20121499 is a wasteful number, since it uses less digits than its factorization.

20121499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 20121499 is about 4485.6993880553. The cubic root of 20121499 is about 271.9903173817.

The spelling of 20121499 in words is "twenty million, one hundred twenty-one thousand, four hundred ninety-nine".