21101122201 has 16 divisors (see below), whose sum is σ = 22598956800. Its totient is φ = 19642338000.

The previous prime is 21101122199. The next prime is 21101122213. The reversal of 21101122201 is 10222110112.

It is a cyclic number.

It is not a de Polignac number, because 21101122201 - 2¹ = 21101122199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101122901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3731226 + ... + 3736876.

It is an arithmetic number, because the mean of its divisors is an integer number (1412434800).

Almost surely, 2^21101122201 is an apocalyptic number.

It is an amenable number.

21101122201 is a deficient number, since it is larger than the sum of its proper divisors (1497834599).

21101122201 is a wasteful number, since it uses less digits than its factorization.

21101122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9060.

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

Adding to 21101122201 its reverse (10222110112), we get a palindrome (31323232313).

The spelling of 21101122201 in words is "twenty-one billion, one hundred one million, one hundred twenty-two thousand, two hundred one".