20121099 has 8 divisors (see below), whose sum is σ = 27753360. Its totient is φ = 12951456.

The previous prime is 20121097. The next prime is 20121103. The reversal of 20121099 is 99012102.

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

It is not a de Polignac number, because 20121099 - 2¹ = 20121097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115552 + ... + 115725.

It is an arithmetic number, because the mean of its divisors is an integer number (3469170).

Almost surely, 2^20121099 is an apocalyptic number.

20121099 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20121099 is a deficient number, since it is larger than the sum of its proper divisors (7632261).

20121099 is a wasteful number, since it uses less digits than its factorization.

20121099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231309.

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

The square root of 20121099 is about 4485.6548016984. The cubic root of 20121099 is about 271.9885150500.

The spelling of 20121099 in words is "twenty million, one hundred twenty-one thousand, ninety-nine".