31012121201 has 4 divisors (see below), whose sum is σ = 31012484592. Its totient is φ = 31011757812.

The previous prime is 31012121197. The next prime is 31012121209. The reversal of 31012121201 is 10212121013.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31012121201 - 2² = 31012121197 is a prime.

It is a super-2 number, since 2×31012121201² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31012121209) 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, 23750 + ... + 250176.

It is an arithmetic number, because the mean of its divisors is an integer number (7753121148).

Almost surely, 2^31012121201 is an apocalyptic number.

It is an amenable number.

31012121201 is a deficient number, since it is larger than the sum of its proper divisors (363391).

31012121201 is a wasteful number, since it uses less digits than its factorization.

31012121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363390.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31012121201 its reverse (10212121013), we get a palindrome (41224242214).

The spelling of 31012121201 in words is "thirty-one billion, twelve million, one hundred twenty-one thousand, two hundred one".