21211100111002 has 16 divisors (see below), whose sum is σ = 32031241603200. Its totient is φ = 10534190499072.

The previous prime is 21211100110973. The next prime is 21211100111017. The reversal of 21211100111002 is 20011100111212.

It is a happy 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, 42482002 + ... + 42978397.

It is an arithmetic number, because the mean of its divisors is an integer number (2001952600200).

Almost surely, 2^{21211100111002} is an apocalyptic number.

21211100111002 is a deficient number, since it is larger than the sum of its proper divisors (10820141492198).

21211100111002 is a wasteful number, since it uses less digits than its factorization.

21211100111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85461237.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21211100111002 its reverse (20011100111212), we get a palindrome (41222200222214).

The spelling of 21211100111002 in words is "twenty-one trillion, two hundred eleven billion, one hundred million, one hundred eleven thousand, two".