21111220200001 has 8 divisors (see below), whose sum is σ = 22355308150920. Its totient is φ = 19867382412288.

The previous prime is 21111220199999. The next prime is 21111220200011. The reversal of 21111220200001 is 10000202211112.

It can be written as a sum of positive squares in 4 ways, for example, as 3275810406400 + 17835409793601 = 1809920^2 + 4223199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21111220200001 - 2¹ = 21111220199999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111220200011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62367036 + ... + 62704621.

It is an arithmetic number, because the mean of its divisors is an integer number (2794413518865).

Almost surely, 2^{21111220200001} is an apocalyptic number.

It is an amenable number.

21111220200001 is a deficient number, since it is larger than the sum of its proper divisors (1244087950919).

21111220200001 is a wasteful number, since it uses less digits than its factorization.

21111220200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125081603.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21111220200001 its reverse (10000202211112), we get a palindrome (31111422411113).

The spelling of 21111220200001 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty million, two hundred thousand, one".