31213214 has 4 divisors (see below), whose sum is σ = 46819824. Its totient is φ = 15606606.

The previous prime is 31213213. The next prime is 31213243. The reversal of 31213214 is 41231213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41231213 = 6269 ⋅6577.

It is a super-3 number, since 3×31213214³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31213192 and 31213201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7803302 + ... + 7803305.

It is an arithmetic number, because the mean of its divisors is an integer number (11704956).

Almost surely, 2^31213214 is an apocalyptic number.

31213214 is a deficient number, since it is larger than the sum of its proper divisors (15606610).

31213214 is a wasteful number, since it uses less digits than its factorization.

31213214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606609.

The product of its digits is 144, while the sum is 17.

The square root of 31213214 is about 5586.8787350362. The cubic root of 31213214 is about 314.8566207307.

Adding to 31213214 its reverse (41231213), we get a palindrome (72444427).

The spelling of 31213214 in words is "thirty-one million, two hundred thirteen thousand, two hundred fourteen".