21122413021 has 8 divisors (see below), whose sum is σ = 21680236800. Its totient is φ = 20569106448.

The previous prime is 21122413019. The next prime is 21122413049. The reversal of 21122413021 is 12031422112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122413021 - 2¹ = 21122413019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122413021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122413061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1119826 + ... + 1138531.

It is an arithmetic number, because the mean of its divisors is an integer number (2710029600).

Almost surely, 2^21122413021 is an apocalyptic number.

It is an amenable number.

21122413021 is a deficient number, since it is larger than the sum of its proper divisors (557823779).

21122413021 is a wasteful number, since it uses less digits than its factorization.

21122413021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258603.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21122413021 its reverse (12031422112), we get a palindrome (33153835133).

Subtracting from 21122413021 its reverse (12031422112), we obtain a palindrome (9090990909).

The spelling of 21122413021 in words is "twenty-one billion, one hundred twenty-two million, four hundred thirteen thousand, twenty-one".