21022023 has 16 divisors (see below), whose sum is σ = 31908096. Its totient is φ = 12186240.

The previous prime is 21022021. The next prime is 21022049. The reversal of 21022023 is 32022012.

21022023 = 967² + 968² + ... + 988².

It is not a de Polignac number, because 21022023 - 2¹ = 21022021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13090 + ... + 14607.

It is an arithmetic number, because the mean of its divisors is an integer number (1994256).

Almost surely, 2^21022023 is an apocalyptic number.

21022023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21022023 is a deficient number, since it is larger than the sum of its proper divisors (10886073).

21022023 is a wasteful number, since it uses less digits than its factorization.

21022023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27734.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21022023 is about 4584.9779715938. The cubic root of 21022023 is about 275.9888280502.

Adding to 21022023 its reverse (32022012), we get a palindrome (53044035).

The spelling of 21022023 in words is "twenty-one million, twenty-two thousand, twenty-three".