21122222001 has 4 divisors (see below), whose sum is σ = 28162962672. Its totient is φ = 14081481332.

The previous prime is 21122221973. The next prime is 21122222057. The reversal of 21122222001 is 10022222112.

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 21122222001 - 2⁶ = 21122221937 is a prime.

It is a super-2 number, since 2×21122222001² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122222071) 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, 3520370331 + ... + 3520370336.

It is an arithmetic number, because the mean of its divisors is an integer number (7040740668).

Almost surely, 2^21122222001 is an apocalyptic number.

It is an amenable number.

21122222001 is a deficient number, since it is larger than the sum of its proper divisors (7040740671).

21122222001 is an equidigital number, since it uses as much as digits as its factorization.

21122222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040740670.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21122222001 its reverse (10022222112), we get a palindrome (31144444113).

The spelling of 21122222001 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, one".