31220143432431 has 4 divisors (see below), whose sum is σ = 41626857909912. Its totient is φ = 20813428954952.

The previous prime is 31220143432427. The next prime is 31220143432451. The reversal of 31220143432431 is 13423434102213.

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

It is a cyclic number.

It is not a de Polignac number, because 31220143432431 - 2² = 31220143432427 is a prime.

It is a super-2 number, since 2×31220143432431² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31220143432392 and 31220143432401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220143432411) 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, 5203357238736 + ... + 5203357238741.

It is an arithmetic number, because the mean of its divisors is an integer number (10406714477478).

Almost surely, 2^{31220143432431} is an apocalyptic number.

31220143432431 is a deficient number, since it is larger than the sum of its proper divisors (10406714477481).

31220143432431 is a wasteful number, since it uses less digits than its factorization.

31220143432431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10406714477480.

The product of its (nonzero) digits is 41472, while the sum is 33.

Adding to 31220143432431 its reverse (13423434102213), we get a palindrome (44643577534644).

The spelling of 31220143432431 in words is "thirty-one trillion, two hundred twenty billion, one hundred forty-three million, four hundred thirty-two thousand, four hundred thirty-one".