21011002222 has 16 divisors (see below), whose sum is σ = 37260891360. Its totient is φ = 8694207648.

The previous prime is 21011002217. The next prime is 21011002231. The reversal of 21011002222 is 22220011012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25875213 + ... + 25876024.

It is an arithmetic number, because the mean of its divisors is an integer number (2328805710).

Almost surely, 2^21011002222 is an apocalyptic number.

21011002222 is a deficient number, since it is larger than the sum of its proper divisors (16249889138).

21011002222 is a wasteful number, since it uses less digits than its factorization.

21011002222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51751275.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21011002222 its reverse (22220011012), we get a palindrome (43231013234).

The spelling of 21011002222 in words is "twenty-one billion, eleven million, two thousand, two hundred twenty-two".