21301212222 has 32 divisors (see below), whose sum is σ = 47824039200. Its totient is φ = 7027202304.

The previous prime is 21301212221. The next prime is 21301212241. The reversal of 21301212222 is 22221210312.

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 = 21301212195 and 21301212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301212221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2028097 + ... + 2038572.

It is an arithmetic number, because the mean of its divisors is an integer number (1494501225).

Almost surely, 2^21301212222 is an apocalyptic number.

21301212222 is an abundant number, since it is smaller than the sum of its proper divisors (26522826978).

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

21301212222 is a wasteful number, since it uses less digits than its factorization.

21301212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066777 (or 4066771 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21301212222 its reverse (22221210312), we get a palindrome (43522422534).

The spelling of 21301212222 in words is "twenty-one billion, three hundred one million, two hundred twelve thousand, two hundred twenty-two".