21213022201 has 4 divisors (see below), whose sum is σ = 24243453952. Its totient is φ = 18182590452.

The previous prime is 21213022189. The next prime is 21213022213. The reversal of 21213022201 is 10222031212.

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 an interprime number because it is at equal distance from previous prime (21213022189) and next prime (21213022213).

It is a cyclic number.

It is not a de Polignac number, because 21213022201 - 2¹⁹ = 21212497913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213022001) 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, 1515215865 + ... + 1515215878.

It is an arithmetic number, because the mean of its divisors is an integer number (6060863488).

Almost surely, 2^21213022201 is an apocalyptic number.

It is an amenable number.

21213022201 is a deficient number, since it is larger than the sum of its proper divisors (3030431751).

21213022201 is an equidigital number, since it uses as much as digits as its factorization.

21213022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030431750.

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

Adding to 21213022201 its reverse (10222031212), we get a palindrome (31435053413).

The spelling of 21213022201 in words is "twenty-one billion, two hundred thirteen million, twenty-two thousand, two hundred one".