31642123121 has 4 divisors (see below), whose sum is σ = 36162426432. Its totient is φ = 27121819812.

The previous prime is 31642123099. The next prime is 31642123153. The reversal of 31642123121 is 12132124613.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 31642123121 - 2¹⁴ = 31642106737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31642123021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2260151645 + ... + 2260151658.

It is an arithmetic number, because the mean of its divisors is an integer number (9040606608).

Almost surely, 2^31642123121 is an apocalyptic number.

It is an amenable number.

31642123121 is a deficient number, since it is larger than the sum of its proper divisors (4520303311).

31642123121 is an equidigital number, since it uses as much as digits as its factorization.

31642123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4520303310.

The product of its digits is 1728, while the sum is 26.

Adding to 31642123121 its reverse (12132124613), we get a palindrome (43774247734).

The spelling of 31642123121 in words is "thirty-one billion, six hundred forty-two million, one hundred twenty-three thousand, one hundred twenty-one".