31113211421 has 4 divisors (see below), whose sum is σ = 31340315292. Its totient is φ = 30886107552.

The previous prime is 31113211391. The next prime is 31113211433. The reversal of 31113211421 is 12411231113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26850427321 + 4262784100 = 163861^2 + 65290^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113211421 - 2¹⁴ = 31113195037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31113211393 and 31113211402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113201421) 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, 113551730 + ... + 113552003.

It is an arithmetic number, because the mean of its divisors is an integer number (7835078823).

Almost surely, 2^31113211421 is an apocalyptic number.

It is an amenable number.

31113211421 is a deficient number, since it is larger than the sum of its proper divisors (227103871).

31113211421 is a wasteful number, since it uses less digits than its factorization.

31113211421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227103870.

The product of its digits is 144, while the sum is 20.

Adding to 31113211421 its reverse (12411231113), we get a palindrome (43524442534).

The spelling of 31113211421 in words is "thirty-one billion, one hundred thirteen million, two hundred eleven thousand, four hundred twenty-one".