21300312222 has 48 divisors (see below), whose sum is σ = 52857692160. Its totient is φ = 6072642576.

The previous prime is 21300312221. The next prime is 21300312233. The reversal of 21300312222 is 22221300312.

21300312222 is a `hidden beast` number, since 2 + 130 + 0 + 312 + 222 = 666.

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 = 21300312195 and 21300312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300312221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124222 + ... + 240897.

It is an arithmetic number, because the mean of its divisors is an integer number (1101201920).

Almost surely, 2^21300312222 is an apocalyptic number.

21300312222 is an abundant number, since it is smaller than the sum of its proper divisors (31557379938).

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

21300312222 is a wasteful number, since it uses less digits than its factorization.

21300312222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365597 (or 365594 counting only the distinct ones).

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

Adding to 21300312222 its reverse (22221300312), we get a palindrome (43521612534).

The spelling of 21300312222 in words is "twenty-one billion, three hundred million, three hundred twelve thousand, two hundred twenty-two".