21221020221102 has 96 divisors (see below), whose sum is σ = 49990103366112. Its totient is φ = 6467016229632.

The previous prime is 21221020221083. The next prime is 21221020221127. The reversal of 21221020221102 is 20112202012212.

It is a happy number.

21221020221102 is a `hidden beast` number, since 212 + 210 + 20 + 221 + 1 + 0 + 2 = 666.

It is a super-3 number, since 3×21221020221102³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109995708 + ... + 110188464.

It is an arithmetic number, because the mean of its divisors is an integer number (520730243397).

Almost surely, 2^{21221020221102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221020221102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24995051683056).

21221020221102 is an abundant number, since it is smaller than the sum of its proper divisors (28769083145010).

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

21221020221102 is a wasteful number, since it uses less digits than its factorization.

21221020221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197282 (or 197279 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221020221102 its reverse (20112202012212), we get a palindrome (41333222233314).

The spelling of 21221020221102 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred twenty-one thousand, one hundred two".