21221211112102 has 8 divisors (see below), whose sum is σ = 33704276472216. Its totient is φ = 9986452288032.

The previous prime is 21221211112097. The next prime is 21221211112181. The reversal of 21221211112102 is 20121111212212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21221211112102² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21221211112102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312076633968 + ... + 312076634035.

It is an arithmetic number, because the mean of its divisors is an integer number (4213034559027).

Almost surely, 2^{21221211112102} is an apocalyptic number.

21221211112102 is a deficient number, since it is larger than the sum of its proper divisors (12483065360114).

21221211112102 is a wasteful number, since it uses less digits than its factorization.

21221211112102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624153268022.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21221211112102 its reverse (20121111212212), we get a palindrome (41342322324314).

The spelling of 21221211112102 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twelve thousand, one hundred two".