21042223001 has 4 divisors (see below), whose sum is σ = 21110764752. Its totient is φ = 20973681252.

The previous prime is 21042222983. The next prime is 21042223039. The reversal of 21042223001 is 10032224012.

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 21042223001 - 2¹⁸ = 21041960857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21042223051) 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, 34270415 + ... + 34271028.

It is an arithmetic number, because the mean of its divisors is an integer number (5277691188).

Almost surely, 2^21042223001 is an apocalyptic number.

It is an amenable number.

21042223001 is a deficient number, since it is larger than the sum of its proper divisors (68541751).

21042223001 is an equidigital number, since it uses as much as digits as its factorization.

21042223001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68541750.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21042223001 its reverse (10032224012), we get a palindrome (31074447013).

The spelling of 21042223001 in words is "twenty-one billion, forty-two million, two hundred twenty-three thousand, one".