21001243022 has 4 divisors (see below), whose sum is σ = 31501864536. Its totient is φ = 10500621510.

The previous prime is 21001243019. The next prime is 21001243037. The reversal of 21001243022 is 22034210012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5250310754 + ... + 5250310757.

It is an arithmetic number, because the mean of its divisors is an integer number (7875466134).

Almost surely, 2^21001243022 is an apocalyptic number.

21001243022 is a deficient number, since it is larger than the sum of its proper divisors (10500621514).

21001243022 is a wasteful number, since it uses less digits than its factorization.

21001243022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500621513.

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

Adding to 21001243022 its reverse (22034210012), we get a palindrome (43035453034).

The spelling of 21001243022 in words is "twenty-one billion, one million, two hundred forty-three thousand, twenty-two".