21111120111002 has 16 divisors (see below), whose sum is σ = 31707951978600. Its totient is φ = 10541809313280.

The previous prime is 21111120110989. The next prime is 21111120111023. The reversal of 21111120111002 is 20011102111112.

It can be written as a sum of positive squares in 4 ways, for example, as 20154164656921 + 956955454081 = 4489339^2 + 978241^2 .

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, 4845752 + ... + 8105772.

Almost surely, 2^{21111120111002} is an apocalyptic number.

21111120111002 is a deficient number, since it is larger than the sum of its proper divisors (10596831867598).

21111120111002 is a wasteful number, since it uses less digits than its factorization.

21111120111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264241.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21111120111002 its reverse (20011102111112), we get a palindrome (41122222222114).

The spelling of 21111120111002 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty million, one hundred eleven thousand, two".