202121002202009 has 4 divisors (see below), whose sum is σ = 220495638765840. Its totient is φ = 183746365638180.

The previous prime is 202121002201927. The next prime is 202121002202051. The reversal of 202121002202009 is 900202200121202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202121002202009 is a prime.

It is a super-2 number, since 2×202121002202009² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202121002262009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9187318281899 + ... + 9187318281920.

It is an arithmetic number, because the mean of its divisors is an integer number (55123909691460).

Almost surely, 2^{202121002202009} is an apocalyptic number.

It is an amenable number.

202121002202009 is a deficient number, since it is larger than the sum of its proper divisors (18374636563831).

202121002202009 is a wasteful number, since it uses less digits than its factorization.

202121002202009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18374636563830.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 202121002202009 in words is "two hundred two trillion, one hundred twenty-one billion, two million, two hundred two thousand, nine".