21203312222 has 4 divisors (see below), whose sum is σ = 31804968336. Its totient is φ = 10601656110.

The previous prime is 21203312201. The next prime is 21203312227. The reversal of 21203312222 is 22221330212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21203312222² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21203312194 and 21203312203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203312227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300828054 + ... + 5300828057.

It is an arithmetic number, because the mean of its divisors is an integer number (7951242084).

Almost surely, 2^21203312222 is an apocalyptic number.

21203312222 is a deficient number, since it is larger than the sum of its proper divisors (10601656114).

21203312222 is a wasteful number, since it uses less digits than its factorization.

21203312222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601656113.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21203312222 its reverse (22221330212), we get a palindrome (43424642434).

The spelling of 21203312222 in words is "twenty-one billion, two hundred three million, three hundred twelve thousand, two hundred twenty-two".