31012220021031 has 6 divisors (see below), whose sum is σ = 44795428919280. Its totient is φ = 20674813347348.

The previous prime is 31012220021023. The next prime is 31012220021117. The reversal of 31012220021031 is 13012002221013.

31012220021031 is a `hidden beast` number, since 310 + 122 + 20 + 0 + 210 + 3 + 1 = 666.

It is not a de Polignac number, because 31012220021031 - 2³ = 31012220021023 is a prime.

It is a super-2 number, since 2×31012220021031² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31012220020995 and 31012220021013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012220021021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1722901112271 + ... + 1722901112288.

It is an arithmetic number, because the mean of its divisors is an integer number (7465904819880).

Almost surely, 2^{31012220021031} is an apocalyptic number.

31012220021031 is a deficient number, since it is larger than the sum of its proper divisors (13783208898249).

31012220021031 is a wasteful number, since it uses less digits than its factorization.

31012220021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3445802224565 (or 3445802224562 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31012220021031 its reverse (13012002221013), we get a palindrome (44024222242044).

The spelling of 31012220021031 in words is "thirty-one trillion, twelve billion, two hundred twenty million, twenty-one thousand, thirty-one".