20212099 has 4 divisors (see below), whose sum is σ = 21401064. Its totient is φ = 19023136.

The previous prime is 20212097. The next prime is 20212103. The reversal of 20212099 is 99021202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20212099 - 2¹ = 20212097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594457 + ... + 594490.

It is an arithmetic number, because the mean of its divisors is an integer number (5350266).

Almost surely, 2^20212099 is an apocalyptic number.

20212099 is a deficient number, since it is larger than the sum of its proper divisors (1188965).

20212099 is a wasteful number, since it uses less digits than its factorization.

20212099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188964.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 20212099 is about 4495.7868054435. The cubic root of 20212099 is about 272.3979316416.

The spelling of 20212099 in words is "twenty million, two hundred twelve thousand, ninety-nine".