21002230001 has 4 divisors (see below), whose sum is σ = 21003564912. Its totient is φ = 21000895092.

The previous prime is 21002229967. The next prime is 21002230019. The reversal of 21002230001 is 10003220012.

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 21002230001 - 2²² = 20998035697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002230901) 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, 643571 + ... + 675416.

It is an arithmetic number, because the mean of its divisors is an integer number (5250891228).

Almost surely, 2^21002230001 is an apocalyptic number.

It is an amenable number.

21002230001 is a deficient number, since it is larger than the sum of its proper divisors (1334911).

21002230001 is a wasteful number, since it uses less digits than its factorization.

21002230001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334910.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21002230001 its reverse (10003220012), we get a palindrome (31005450013).

The spelling of 21002230001 in words is "twenty-one billion, two million, two hundred thirty thousand, one".