31402221 has 8 divisors (see below), whose sum is σ = 41911584. Its totient is φ = 20913840.

The previous prime is 31402211. The next prime is 31402223. The reversal of 31402221 is 12220413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31402221 - 2⁹ = 31401709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31402221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1335 + ... + 8036.

It is an arithmetic number, because the mean of its divisors is an integer number (5238948).

Almost surely, 2^31402221 is an apocalyptic number.

It is an amenable number.

31402221 is a deficient number, since it is larger than the sum of its proper divisors (10509363).

31402221 is a wasteful number, since it uses less digits than its factorization.

31402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10491.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 31402221 is about 5603.7684641677. The cubic root of 31402221 is about 315.4908648211.

Adding to 31402221 its reverse (12220413), we get a palindrome (43622634).

The spelling of 31402221 in words is "thirty-one million, four hundred two thousand, two hundred twenty-one".