21212022001 has 4 divisors (see below), whose sum is σ = 21212416512. Its totient is φ = 21211627492.

The previous prime is 21212021959. The next prime is 21212022019. The reversal of 21212022001 is 10022021212.

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 21212022001 - 2¹¹ = 21212019953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212022071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100921 + ... + 229366.

It is an arithmetic number, because the mean of its divisors is an integer number (5303104128).

Almost surely, 2^21212022001 is an apocalyptic number.

It is an amenable number.

21212022001 is a deficient number, since it is larger than the sum of its proper divisors (394511).

21212022001 is an equidigital number, since it uses as much as digits as its factorization.

21212022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394510.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21212022001 its reverse (10022021212), we get a palindrome (31234043213).

The spelling of 21212022001 in words is "twenty-one billion, two hundred twelve million, twenty-two thousand, one".