21111200021010 has 64 divisors (see below), whose sum is σ = 55842784470144. Its totient is φ = 5065105152000.

The previous prime is 21111200020987. The next prime is 21111200021033. The reversal of 21111200021010 is 1012000211112.

It is an interprime number because it is at equal distance from previous prime (21111200020987) and next prime (21111200021033).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 329727441 + ... + 329791460.

It is an arithmetic number, because the mean of its divisors is an integer number (872543507346).

Almost surely, 2^{21111200021010} is an apocalyptic number.

21111200021010 is an abundant number, since it is smaller than the sum of its proper divisors (34731584449134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111200021010 is a wasteful number, since it uses less digits than its factorization.

21111200021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659519019.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111200021010 its reverse (1012000211112), we get a palindrome (22123200232122).

The spelling of 21111200021010 in words is "twenty-one trillion, one hundred eleven billion, two hundred million, twenty-one thousand, ten".