21031312322 has 8 divisors (see below), whose sum is σ = 31554932736. Its totient is φ = 10513001412.

The previous prime is 21031312307. The next prime is 21031312369. The reversal of 21031312322 is 22321313012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21031312294 and 21031312303.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317458 + ... + 1333325.

It is an arithmetic number, because the mean of its divisors is an integer number (3944366592).

Almost surely, 2^21031312322 is an apocalyptic number.

21031312322 is a deficient number, since it is larger than the sum of its proper divisors (10523620414).

21031312322 is a wasteful number, since it uses less digits than its factorization.

21031312322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654752.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21031312322 its reverse (22321313012), we get a palindrome (43352625334).

The spelling of 21031312322 in words is "twenty-one billion, thirty-one million, three hundred twelve thousand, three hundred twenty-two".