21002012222 has 16 divisors (see below), whose sum is σ = 32592898800. Its totient is φ = 10137792000.

The previous prime is 21002012209. The next prime is 21002012237. The reversal of 21002012222 is 22221020012.

It is a junction number, because it is equal to n+sod(n) for n = 21002012197 and 21002012206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813854 + ... + 839262.

It is an arithmetic number, because the mean of its divisors is an integer number (2037056175).

Almost surely, 2^21002012222 is an apocalyptic number.

21002012222 is a deficient number, since it is larger than the sum of its proper divisors (11590886578).

21002012222 is a wasteful number, since it uses less digits than its factorization.

21002012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39691.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21002012222 its reverse (22221020012), we get a palindrome (43223032234).

The spelling of 21002012222 in words is "twenty-one billion, two million, twelve thousand, two hundred twenty-two".