21221110001 has 16 divisors (see below), whose sum is σ = 26476082304. Its totient is φ = 16560319104.

The previous prime is 21221109971. The next prime is 21221110003. The reversal of 21221110001 is 10001112212.

It is not a de Polignac number, because 21221110001 - 2²² = 21216915697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221110003) 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, 1590611 + ... + 1603896.

It is an arithmetic number, because the mean of its divisors is an integer number (1654755144).

Almost surely, 2^21221110001 is an apocalyptic number.

It is an amenable number.

21221110001 is a deficient number, since it is larger than the sum of its proper divisors (5254972303).

21221110001 is a wasteful number, since it uses less digits than its factorization.

21221110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194600.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21221110001 its reverse (10001112212), we get a palindrome (31222222213).

The spelling of 21221110001 in words is "twenty-one billion, two hundred twenty-one million, one hundred ten thousand, one".