21001111120102 has 8 divisors (see below), whose sum is σ = 31505764747536. Its totient is φ = 10499189537592.

The previous prime is 21001111120037. The next prime is 21001111120133. The reversal of 21001111120102 is 20102111110012.

It is a happy number.

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

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, 682992013 + ... + 683022760.

It is an arithmetic number, because the mean of its divisors is an integer number (3938220593442).

Almost surely, 2^{21001111120102} is an apocalyptic number.

21001111120102 is a deficient number, since it is larger than the sum of its proper divisors (10504653627434).

21001111120102 is a wasteful number, since it uses less digits than its factorization.

21001111120102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366022462.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21001111120102 its reverse (20102111110012), we get a palindrome (41103222230114).

The spelling of 21001111120102 in words is "twenty-one trillion, one billion, one hundred eleven million, one hundred twenty thousand, one hundred two".