21020001021102 has 16 divisors (see below), whose sum is σ = 43867828218240. Its totient is φ = 6702029311032.

The previous prime is 21020001021007. The next prime is 21020001021127. The reversal of 21020001021102 is 20112010002012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76159423852 + ... + 76159424127.

It is an arithmetic number, because the mean of its divisors is an integer number (2741739263640).

Almost surely, 2^{21020001021102} is an apocalyptic number.

21020001021102 is an abundant number, since it is smaller than the sum of its proper divisors (22847827197138).

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

21020001021102 is a wasteful number, since it uses less digits than its factorization.

21020001021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152318848007.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020001021102 its reverse (20112010002012), we get a palindrome (41132011023114).

The spelling of 21020001021102 in words is "twenty-one trillion, twenty billion, one million, twenty-one thousand, one hundred two".