21111220220101 has 12 divisors (see below), whose sum is σ = 23371836661600. Its totient is φ = 19053946292040.

The previous prime is 21111220220099. The next prime is 21111220220107. The reversal of 21111220220101 is 10102202211112.

It is not a de Polignac number, because 21111220220101 - 2¹ = 21111220220099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111220220107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 627583521 + ... + 627617158.

Almost surely, 2^{21111220220101} is an apocalyptic number.

It is an amenable number.

21111220220101 is a deficient number, since it is larger than the sum of its proper divisors (2260616441499).

21111220220101 is a wasteful number, since it uses less digits than its factorization.

21111220220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255200840 (or 1255200829 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21111220220101 its reverse (10102202211112), we get a palindrome (31213422431213).

The spelling of 21111220220101 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty million, two hundred twenty thousand, one hundred one".