21273023 has 2 divisors, whose sum is σ = 21273024. Its totient is φ = 21273022.

The previous prime is 21273019. The next prime is 21273061. The reversal of 21273023 is 32037212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21273023 - 2² = 21273019 is a prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21272986 and 21273004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21273013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10636511 + 10636512.

It is an arithmetic number, because the mean of its divisors is an integer number (10636512).

Almost surely, 2^21273023 is an apocalyptic number.

21273023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21273023 is an equidigital number, since it uses as much as digits as its factorization.

21273023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 21273023 is about 4612.2687475905. The cubic root of 21273023 is about 277.0829077550.

The spelling of 21273023 in words is "twenty-one million, two hundred seventy-three thousand, twenty-three".