31220121133 has 8 divisors (see below), whose sum is σ = 32674195008. Its totient is φ = 29774103744.

The previous prime is 31220121091. The next prime is 31220121137. The reversal of 31220121133 is 33112102213.

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

It is a cyclic number.

It is not a de Polignac number, because 31220121133 - 2²¹ = 31218023981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31220121133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220121137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2006191 + ... + 2021692.

It is an arithmetic number, because the mean of its divisors is an integer number (4084274376).

Almost surely, 2^31220121133 is an apocalyptic number.

It is an amenable number.

31220121133 is a deficient number, since it is larger than the sum of its proper divisors (1454073875).

31220121133 is a wasteful number, since it uses less digits than its factorization.

31220121133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028243.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31220121133 its reverse (33112102213), we get a palindrome (64332223346).

The spelling of 31220121133 in words is "thirty-one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred thirty-three".