31540202121 has 8 divisors (see below), whose sum is σ = 42099972064. Its totient is φ = 21003616800.

The previous prime is 31540202117. The next prime is 31540202159. The reversal of 31540202121 is 12120204513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31540202121 - 2² = 31540202117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31540206121) 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 7 ways as a sum of consecutive naturals, for example, 5792980 + ... + 5798421.

It is an arithmetic number, because the mean of its divisors is an integer number (5262496508).

Almost surely, 2^31540202121 is an apocalyptic number.

It is an amenable number.

31540202121 is a deficient number, since it is larger than the sum of its proper divisors (10559769943).

31540202121 is a wasteful number, since it uses less digits than its factorization.

31540202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11592311.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 31540202121 its reverse (12120204513), we get a palindrome (43660406634).

The spelling of 31540202121 in words is "thirty-one billion, five hundred forty million, two hundred two thousand, one hundred twenty-one".