21201000222 has 32 divisors (see below), whose sum is σ = 43625607552. Its totient is φ = 6863746464.

The previous prime is 21201000221. The next prime is 21201000251. The reversal of 21201000222 is 22200010212.

It is a junction number, because it is equal to n+sod(n) for n = 21201000198 and 21201000207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201000221) 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, 40173 + ... + 209799.

It is an arithmetic number, because the mean of its divisors is an integer number (1363300236).

Almost surely, 2^21201000222 is an apocalyptic number.

21201000222 is an abundant number, since it is smaller than the sum of its proper divisors (22424607330).

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

21201000222 is a wasteful number, since it uses less digits than its factorization.

21201000222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170232.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21201000222 its reverse (22200010212), we get a palindrome (43401010434).

The spelling of 21201000222 in words is "twenty-one billion, two hundred one million, two hundred twenty-two", and thus it is an aban number.