21001112021102 has 16 divisors (see below), whose sum is σ = 31591824606000. Its totient is φ = 10470533445120.

The previous prime is 21001112021077. The next prime is 21001112021173. The reversal of 21001112021102 is 20112021110012.

It is a super-2 number, since 2×21001112021102² (a number of 27 digits) contains 22 as substring.

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, 5987549 + ... + 8823432.

It is an arithmetic number, because the mean of its divisors is an integer number (1974489037875).

Almost surely, 2^{21001112021102} is an apocalyptic number.

21001112021102 is a deficient number, since it is larger than the sum of its proper divisors (10590712584898).

21001112021102 is a wasteful number, since it uses less digits than its factorization.

21001112021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14813011.

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

Adding to 21001112021102 its reverse (20112021110012), we get a palindrome (41113133131114).

The spelling of 21001112021102 in words is "twenty-one trillion, one billion, one hundred twelve million, twenty-one thousand, one hundred two".