21121222023 has 48 divisors (see below), whose sum is σ = 34855382016. Its totient is φ = 12199619520.

The previous prime is 21121222009. The next prime is 21121222049. The reversal of 21121222023 is 32022212112.

21121222023 is a `hidden beast` number, since 211 + 212 + 220 + 23 = 666.

It is not a de Polignac number, because 21121222023 - 2¹⁰ = 21121220999 is a prime.

It is a super-2 number, since 2×21121222023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121221987 and 21121222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121222823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 613986 + ... + 647472.

It is an arithmetic number, because the mean of its divisors is an integer number (726153792).

Almost surely, 2^21121222023 is an apocalyptic number.

21121222023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21121222023 is a deficient number, since it is larger than the sum of its proper divisors (13734159993).

21121222023 is a wasteful number, since it uses less digits than its factorization.

21121222023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33804 (or 33801 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21121222023 its reverse (32022212112), we get a palindrome (53143434135).

The spelling of 21121222023 in words is "twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty-three".