21012003222 has 32 divisors (see below), whose sum is σ = 48045633792. Its totient is φ = 6001154784.

The previous prime is 21012003167. The next prime is 21012003239. The reversal of 21012003222 is 22230021012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18993 + ... + 205875.

It is an arithmetic number, because the mean of its divisors is an integer number (1501426056).

Almost surely, 2^21012003222 is an apocalyptic number.

21012003222 is an abundant number, since it is smaller than the sum of its proper divisors (27033630570).

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

21012003222 is a wasteful number, since it uses less digits than its factorization.

21012003222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189572.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21012003222 its reverse (22230021012), we get a palindrome (43242024234).

The spelling of 21012003222 in words is "twenty-one billion, twelve million, three thousand, two hundred twenty-two".