21112122201 has 8 divisors (see below), whose sum is σ = 28292387904. Its totient is φ = 14003302320.

The previous prime is 21112122193. The next prime is 21112122203. The reversal of 21112122201 is 10222121112.

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

It is not a de Polignac number, because 21112122201 - 2³ = 21112122193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112122203) 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, 17860765 + ... + 17861946.

It is an arithmetic number, because the mean of its divisors is an integer number (3536548488).

Almost surely, 2^21112122201 is an apocalyptic number.

It is an amenable number.

21112122201 is a deficient number, since it is larger than the sum of its proper divisors (7180265703).

21112122201 is a wasteful number, since it uses less digits than its factorization.

21112122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35722911.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21112122201 its reverse (10222121112), we get a palindrome (31334243313).

The spelling of 21112122201 in words is "twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, two hundred one".