21322221001 has 4 divisors (see below), whose sum is σ = 22249274112. Its totient is φ = 20395167892.

The previous prime is 21322220977. The next prime is 21322221017. The reversal of 21322221001 is 10012222312.

It is a happy number.

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 21322221001 - 2¹³ = 21322212809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21322221031) 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, 463526521 + ... + 463526566.

It is an arithmetic number, because the mean of its divisors is an integer number (5562318528).

Almost surely, 2^21322221001 is an apocalyptic number.

It is an amenable number.

21322221001 is a deficient number, since it is larger than the sum of its proper divisors (927053111).

21322221001 is an equidigital number, since it uses as much as digits as its factorization.

21322221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927053110.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21322221001 its reverse (10012222312), we get a palindrome (31334443313).

The spelling of 21322221001 in words is "twenty-one billion, three hundred twenty-two million, two hundred twenty-one thousand, one".