123021331 has 2 divisors, whose sum is σ = 123021332. Its totient is φ = 123021330.

The previous prime is 123021307. The next prime is 123021359. The reversal of 123021331 is 133120321.

It is a weak prime.

It is an emirp because it is prime and its reverse (133120321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123021331 - 2¹¹ = 123019283 is a prime.

It is a super-2 number, since 2×123021331² = 30268495762023122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123021391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61510665 + 61510666.

It is an arithmetic number, because the mean of its divisors is an integer number (61510666).

Almost surely, 2^123021331 is an apocalyptic number.

123021331 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021331 is an equidigital number, since it uses as much as digits as its factorization.

123021331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 123021331 is about 11091.4981404678. The cubic root of 123021331 is about 497.3477304761.

Adding to 123021331 its reverse (133120321), we get a palindrome (256141652).

The spelling of 123021331 in words is "one hundred twenty-three million, twenty-one thousand, three hundred thirty-one".