920202121 has 4 divisors (see below), whose sum is σ = 923782932. Its totient is φ = 916621312.

The previous prime is 920202119. The next prime is 920202131. The reversal of 920202121 is 121202029.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121202029 = 13 ⋅9323233.

It can be written as a sum of positive squares in 2 ways, for example, as 874030096 + 46172025 = 29564^2 + 6795^2 .

It is a cyclic number.

It is not a de Polignac number, because 920202121 - 2¹ = 920202119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920202131) 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, 1790020 + ... + 1790533.

It is an arithmetic number, because the mean of its divisors is an integer number (230945733).

Almost surely, 2^920202121 is an apocalyptic number.

It is an amenable number.

920202121 is a deficient number, since it is larger than the sum of its proper divisors (3580811).

920202121 is a wasteful number, since it uses less digits than its factorization.

920202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580810.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 920202121 is about 30334.8334592429. The cubic root of 920202121 is about 972.6600458681.

The spelling of 920202121 in words is "nine hundred twenty million, two hundred two thousand, one hundred twenty-one".