21221000112102 has 128 divisors (see below), whose sum is σ = 50097350983680. Its totient is φ = 5867003560320.

The previous prime is 21221000112089. The next prime is 21221000112173. The reversal of 21221000112102 is 20121100012212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85847599 + ... + 86094437.

It is an arithmetic number, because the mean of its divisors is an integer number (391385554560).

Almost surely, 2^{21221000112102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221000112102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25048675491840).

21221000112102 is an abundant number, since it is smaller than the sum of its proper divisors (28876350871578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221000112102 is a wasteful number, since it uses less digits than its factorization.

21221000112102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247338.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221000112102 its reverse (20121100012212), we get a palindrome (41342100124314).

The spelling of 21221000112102 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve thousand, one hundred two".