202120553 has 4 divisors (see below), whose sum is σ = 203974980. Its totient is φ = 200266128.

The previous prime is 202120543. The next prime is 202120559. The reversal of 202120553 is 355021202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355021202 = 2 ⋅177510601.

It can be written as a sum of positive squares in 2 ways, for example, as 122500624 + 79619929 = 11068^2 + 8923^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120553 - 2¹⁴ = 202104169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202120559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927050 + ... + 927267.

It is an arithmetic number, because the mean of its divisors is an integer number (50993745).

Almost surely, 2^202120553 is an apocalyptic number.

It is an amenable number.

202120553 is a deficient number, since it is larger than the sum of its proper divisors (1854427).

202120553 is a wasteful number, since it uses less digits than its factorization.

202120553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854426.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 202120553 is about 14216.9108107212. The cubic root of 202120553 is about 586.8631304744.

Adding to 202120553 its reverse (355021202), we get a palindrome (557141755).

The spelling of 202120553 in words is "two hundred two million, one hundred twenty thousand, five hundred fifty-three".