21112221001 has 8 divisors (see below), whose sum is σ = 22356069120. Its totient is φ = 19868589888.

The previous prime is 21112220993. The next prime is 21112221023. The reversal of 21112221001 is 10012221112.

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

It is a cyclic number.

It is not a de Polignac number, because 21112221001 - 2³ = 21112220993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112221101) 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, 173380 + ... + 268858.

It is an arithmetic number, because the mean of its divisors is an integer number (2794508640).

Almost surely, 2^21112221001 is an apocalyptic number.

It is an amenable number.

21112221001 is a deficient number, since it is larger than the sum of its proper divisors (1243848119).

21112221001 is a wasteful number, since it uses less digits than its factorization.

21112221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108503.

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

Adding to 21112221001 its reverse (10012221112), we get a palindrome (31124442113).

The spelling of 21112221001 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, one".