21212210122 has 16 divisors (see below), whose sum is σ = 33701088960. Its totient is φ = 9978925248.

The previous prime is 21212210113. The next prime is 21212210209. The reversal of 21212210122 is 22101221212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21212210096 and 21212210105.

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, 3373 + ... + 205999.

It is an arithmetic number, because the mean of its divisors is an integer number (2106318060).

Almost surely, 2^21212210122 is an apocalyptic number.

21212210122 is a deficient number, since it is larger than the sum of its proper divisors (12488878838).

21212210122 is a wasteful number, since it uses less digits than its factorization.

21212210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205725.

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

Adding to 21212210122 its reverse (22101221212), we get a palindrome (43313431334).

The spelling of 21212210122 in words is "twenty-one billion, two hundred twelve million, two hundred ten thousand, one hundred twenty-two".