31220201303431 has 16 divisors (see below), whose sum is σ = 36109536600384. Its totient is φ = 26439686751744.

The previous prime is 31220201303383. The next prime is 31220201303491. The reversal of 31220201303431 is 13430310202213.

It is not a de Polignac number, because 31220201303431 - 2⁷ = 31220201303303 is a prime.

It is a super-2 number, since 2×31220201303431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220201303396 and 31220201303405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220201303491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62003640 + ... + 62505133.

It is an arithmetic number, because the mean of its divisors is an integer number (2256846037524).

Almost surely, 2^{31220201303431} is an apocalyptic number.

31220201303431 is a deficient number, since it is larger than the sum of its proper divisors (4889335296953).

31220201303431 is a wasteful number, since it uses less digits than its factorization.

31220201303431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124509210.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 31220201303431 its reverse (13430310202213), we get a palindrome (44650511505644).

The spelling of 31220201303431 in words is "thirty-one trillion, two hundred twenty billion, two hundred one million, three hundred three thousand, four hundred thirty-one".