21101120111002 has 16 divisors (see below), whose sum is σ = 32439941393832. Its totient is φ = 10288064551680.

The previous prime is 21101120110969. The next prime is 21101120111011. The reversal of 21101120111002 is 20011102110112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19976886141601 + 1124233969401 = 4469551^2 + 1060299^2 .

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, 64395213 + ... + 64722064.

Almost surely, 2^{21101120111002} is an apocalyptic number.

21101120111002 is a deficient number, since it is larger than the sum of its proper divisors (11338821282830).

21101120111002 is a wasteful number, since it uses less digits than its factorization.

21101120111002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129119313.

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

Adding to 21101120111002 its reverse (20011102110112), we get a palindrome (41112222221114).

The spelling of 21101120111002 in words is "twenty-one trillion, one hundred one billion, one hundred twenty million, one hundred eleven thousand, two".