21020231322 has 32 divisors (see below), whose sum is σ = 47025144000. Its totient is φ = 6959715984.

The previous prime is 21020231299. The next prime is 21020231359. The reversal of 21020231322 is 22313202012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21020231295 and 21020231304.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1298208 + ... + 1314299.

It is an arithmetic number, because the mean of its divisors is an integer number (1469535750).

Almost surely, 2^21020231322 is an apocalyptic number.

21020231322 is an abundant number, since it is smaller than the sum of its proper divisors (26004912678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020231322 is a wasteful number, since it uses less digits than its factorization.

21020231322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612667 (or 2612661 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21020231322 its reverse (22313202012), we get a palindrome (43333433334).

The spelling of 21020231322 in words is "twenty-one billion, twenty million, two hundred thirty-one thousand, three hundred twenty-two".