21222212102 has 32 divisors (see below), whose sum is σ = 40882931712. Its totient is φ = 8030572704.

The previous prime is 21222212087. The next prime is 21222212111. The reversal of 21222212102 is 20121222212.

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, 2530718 + ... + 2539089.

It is an arithmetic number, because the mean of its divisors is an integer number (1277591616).

Almost surely, 2^21222212102 is an apocalyptic number.

21222212102 is a deficient number, since it is larger than the sum of its proper divisors (19660719610).

21222212102 is a wasteful number, since it uses less digits than its factorization.

21222212102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5069852.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21222212102 its reverse (20121222212), we get a palindrome (41343434314).

The spelling of 21222212102 in words is "twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred two".