21212111102 has 64 divisors (see below), whose sum is σ = 39656953728. Its totient is φ = 8285760000.

The previous prime is 21212111101. The next prime is 21212111143. The reversal of 21212111102 is 20111121212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212111101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7737452 + ... + 7740192.

It is an arithmetic number, because the mean of its divisors is an integer number (619639902).

Almost surely, 2^21212111102 is an apocalyptic number.

21212111102 is a deficient number, since it is larger than the sum of its proper divisors (18444842626).

21212111102 is a wasteful number, since it uses less digits than its factorization.

21212111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21212111102 its reverse (20111121212), we get a palindrome (41323232314).

The spelling of 21212111102 in words is "twenty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred two".