21020121110102 has 16 divisors (see below), whose sum is σ = 31633696886400. Its totient is φ = 10475561383872.

The previous prime is 21020121110083. The next prime is 21020121110147. The reversal of 21020121110102 is 20101112102012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5681024 + ... + 8620572.

It is an arithmetic number, because the mean of its divisors is an integer number (1977106055400).

Almost surely, 2^{21020121110102} is an apocalyptic number.

21020121110102 is a deficient number, since it is larger than the sum of its proper divisors (10613575776298).

21020121110102 is a wasteful number, since it uses less digits than its factorization.

21020121110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2951287.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21020121110102 its reverse (20101112102012), we get a palindrome (41121233212114).

The spelling of 21020121110102 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, one hundred ten thousand, one hundred two".