31212213427 has 2 divisors, whose sum is σ = 31212213428. Its totient is φ = 31212213426.

The previous prime is 31212213421. The next prime is 31212213433. The reversal of 31212213427 is 72431221213.

It is a balanced prime because it is at equal distance from previous prime (31212213421) and next prime (31212213433).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212213427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31212213395 and 31212213404.

It is not a weakly prime, because it can be changed into another prime (31212213421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606106713 + 15606106714.

It is an arithmetic number, because the mean of its divisors is an integer number (15606106714).

Almost surely, 2^31212213427 is an apocalyptic number.

31212213427 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212213427 is an equidigital number, since it uses as much as digits as its factorization.

31212213427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 28.

The spelling of 31212213427 in words is "thirty-one billion, two hundred twelve million, two hundred thirteen thousand, four hundred twenty-seven".