202120097 has 4 divisors (see below), whose sum is σ = 202535616. Its totient is φ = 201704580.

The previous prime is 202120091. The next prime is 202120099. The reversal of 202120097 is 790021202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 790021202 = 2 ⋅395010601.

It is a cyclic number.

It is not a de Polignac number, because 202120097 - 2²⁴ = 185342881 is a prime.

It is a super-2 number, since 2×202120097² = 81705067222578818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202120091) 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, 207029 + ... + 208002.

It is an arithmetic number, because the mean of its divisors is an integer number (50633904).

Almost surely, 2^202120097 is an apocalyptic number.

It is an amenable number.

202120097 is a deficient number, since it is larger than the sum of its proper divisors (415519).

202120097 is an equidigital number, since it uses as much as digits as its factorization.

202120097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415518.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 202120097 is about 14216.8947734729. The cubic root of 202120097 is about 586.8626891375.

Adding to 202120097 its reverse (790021202), we get a palindrome (992141299).

The spelling of 202120097 in words is "two hundred two million, one hundred twenty thousand, ninety-seven".