21121012222 has 16 divisors (see below), whose sum is σ = 32746676400. Its totient is φ = 10211322240.

The previous prime is 21121012219. The next prime is 21121012223. The reversal of 21121012222 is 22221012112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21121012196 and 21121012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121012223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1459947 + ... + 1474342.

It is an arithmetic number, because the mean of its divisors is an integer number (2046667275).

Almost surely, 2^21121012222 is an apocalyptic number.

21121012222 is a deficient number, since it is larger than the sum of its proper divisors (11625664178).

21121012222 is a wasteful number, since it uses less digits than its factorization.

21121012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2934411.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21121012222 its reverse (22221012112), we get a palindrome (43342024334).

The spelling of 21121012222 in words is "twenty-one billion, one hundred twenty-one million, twelve thousand, two hundred twenty-two".