21111202202201 has 4 divisors (see below), whose sum is σ = 22222318107600. Its totient is φ = 20000086296804.

The previous prime is 21111202202159. The next prime is 21111202202219. The reversal of 21111202202201 is 10220220211112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21111202202201 - 2¹⁸ = 21111201940057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111202202201.

It is not an unprimeable number, because it can be changed into a prime (21111202202221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555557952671 + ... + 555557952708.

It is an arithmetic number, because the mean of its divisors is an integer number (5555579526900).

Almost surely, 2^{21111202202201} is an apocalyptic number.

It is an amenable number.

21111202202201 is a deficient number, since it is larger than the sum of its proper divisors (1111115905399).

21111202202201 is a wasteful number, since it uses less digits than its factorization.

21111202202201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111115905398.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21111202202201 its reverse (10220220211112), we get a palindrome (31331422413313).

The spelling of 21111202202201 in words is "twenty-one trillion, one hundred eleven billion, two hundred two million, two hundred two thousand, two hundred one".