31122202021 has 8 divisors (see below), whose sum is σ = 31488142464. Its totient is φ = 30757849920.

The previous prime is 31122201961. The next prime is 31122202051. The reversal of 31122202021 is 12020222113.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31122202021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31122201986 and 31122202004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122202051) 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, 357645 + ... + 436066.

It is an arithmetic number, because the mean of its divisors is an integer number (3936017808).

Almost surely, 2^31122202021 is an apocalyptic number.

It is an amenable number.

31122202021 is a deficient number, since it is larger than the sum of its proper divisors (365940443).

31122202021 is a wasteful number, since it uses less digits than its factorization.

31122202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794171.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31122202021 its reverse (12020222113), we get a palindrome (43142424134).

The spelling of 31122202021 in words is "thirty-one billion, one hundred twenty-two million, two hundred two thousand, twenty-one".