21012201222 has 8 divisors (see below), whose sum is σ = 42024402456. Its totient is φ = 7004067072.

The previous prime is 21012201211. The next prime is 21012201271. The reversal of 21012201222 is 22210221012.

It is a sphenic number, since it is the product of 3 distinct primes.

21012201222 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751016763 + ... + 1751016774.

It is an arithmetic number, because the mean of its divisors is an integer number (5253050307).

Almost surely, 2^21012201222 is an apocalyptic number.

21012201222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21012201222 is a wasteful number, since it uses less digits than its factorization.

21012201222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3502033542.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21012201222 its reverse (22210221012), we get a palindrome (43222422234).

The spelling of 21012201222 in words is "twenty-one billion, twelve million, two hundred one thousand, two hundred twenty-two".