290938192921 has 4 divisors (see below), whose sum is σ = 290939325732. Its totient is φ = 290937060112.

The previous prime is 290938192903. The next prime is 290938192931. The reversal of 290938192921 is 129291839092.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 184964505625 + 105973687296 = 430075^2 + 325536^2 .

It is a cyclic number.

It is not a de Polignac number, because 290938192921 - 2⁵ = 290938192889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290938192931) 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, 23931 + ... + 763183.

It is an arithmetic number, because the mean of its divisors is an integer number (72734831433).

Almost surely, 2^290938192921 is an apocalyptic number.

It is an amenable number.

290938192921 is a deficient number, since it is larger than the sum of its proper divisors (1132811).

290938192921 is an equidigital number, since it uses as much as digits as its factorization.

290938192921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132810.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The spelling of 290938192921 in words is "two hundred ninety billion, nine hundred thirty-eight million, one hundred ninety-two thousand, nine hundred twenty-one".