21022023243 has 8 divisors (see below), whose sum is σ = 30185469328. Its totient is φ = 12936629664.

The previous prime is 21022023229. The next prime is 21022023283. The reversal of 21022023243 is 34232022012.

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

It is not a de Polignac number, because 21022023243 - 2⁴ = 21022023227 is a prime.

It is a super-2 number, since 2×21022023243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022023283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269513080 + ... + 269513157.

It is an arithmetic number, because the mean of its divisors is an integer number (3773183666).

Almost surely, 2^21022023243 is an apocalyptic number.

21022023243 is a deficient number, since it is larger than the sum of its proper divisors (9163446085).

21022023243 is a wasteful number, since it uses less digits than its factorization.

21022023243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539026253.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21022023243 its reverse (34232022012), we get a palindrome (55254045255).

The spelling of 21022023243 in words is "twenty-one billion, twenty-two million, twenty-three thousand, two hundred forty-three".