21111001111010 has 16 divisors (see below), whose sum is σ = 38011155451776. Its totient is φ = 8441877455088.

The previous prime is 21111001111001. The next prime is 21111001111019. The reversal of 21111001111010 is 1011110011112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21111001111001) and next prime (21111001111019).

It is a junction number, because it is equal to n+sod(n) for n = 21111001110982 and 21111001111000.

It is not an unprimeable number, because it can be changed into a prime (21111001111019) by changing a digit.

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, 315338522 + ... + 315405461.

It is an arithmetic number, because the mean of its divisors is an integer number (2375697215736).

Almost surely, 2^{21111001111010} is an apocalyptic number.

21111001111010 is a deficient number, since it is larger than the sum of its proper divisors (16900154340766).

21111001111010 is a wasteful number, since it uses less digits than its factorization.

21111001111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630747337.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 21111001111010 its reverse (1011110011112), we get a palindrome (22122111122122).

The spelling of 21111001111010 in words is "twenty-one trillion, one hundred eleven billion, one million, one hundred eleven thousand, ten".