21221020122102 has 48 divisors (see below), whose sum is σ = 47755954209600. Its totient is φ = 7062672222792.

The previous prime is 21221020121999. The next prime is 21221020122149. The reversal of 21221020122102 is 20122102012212.

It is a happy number.

21221020122102 is a `hidden beast` number, since 21 + 221 + 0 + 201 + 221 + 0 + 2 = 666.

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 pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33641352 + ... + 34266347.

It is an arithmetic number, because the mean of its divisors is an integer number (994915712700).

Almost surely, 2^{21221020122102} is an apocalyptic number.

21221020122102 is an abundant number, since it is smaller than the sum of its proper divisors (26534934087498).

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

21221020122102 is an equidigital number, since it uses as much as digits as its factorization.

21221020122102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67908359 (or 67908347 counting only the distinct ones).

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

Adding to 21221020122102 its reverse (20122102012212), we get a palindrome (41343122134314).

It can be divided in two parts, 2122102012210 and 2, that added together give a palindrome (2122102012212).

The spelling of 21221020122102 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred two".