21101021111002 has 24 divisors (see below), whose sum is σ = 36858761909460. Its totient is φ = 9033560282880.

The previous prime is 21101021110991. The next prime is 21101021111021. The reversal of 21101021111002 is 20011112010112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21059278943521 + 41742167481 = 4589039^2 + 204309^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115795149 + ... + 115977232.

Almost surely, 2^{21101021111002} is an apocalyptic number.

21101021111002 is a deficient number, since it is larger than the sum of its proper divisors (15757740798458).

21101021111002 is a wasteful number, since it uses less digits than its factorization.

21101021111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231773326 (or 231773319 counting only the distinct ones).

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

Adding to 21101021111002 its reverse (20011112010112), we get a palindrome (41112133121114).

The spelling of 21101021111002 in words is "twenty-one trillion, one hundred one billion, twenty-one million, one hundred eleven thousand, two".