202120999 has 6 divisors (see below), whose sum is σ = 205492560. Its totient is φ = 198803880.

The previous prime is 202120979. The next prime is 202121053. The reversal of 202120999 is 999021202.

It is not a de Polignac number, because 202120999 - 2¹⁷ = 201989927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120969) 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 5 ways as a sum of consecutive naturals, for example, 23439 + ... + 30880.

It is an arithmetic number, because the mean of its divisors is an integer number (34248760).

Almost surely, 2^202120999 is an apocalyptic number.

202120999 is a deficient number, since it is larger than the sum of its proper divisors (3371561).

202120999 is an frugal number, since it uses more digits than its factorization.

202120999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54441 (or 54380 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 202120999 is about 14216.9264962579. The cubic root of 202120999 is about 586.8635621322.

The spelling of 202120999 in words is "two hundred two million, one hundred twenty thousand, nine hundred ninety-nine".