21602423 has 2 divisors, whose sum is σ = 21602424. Its totient is φ = 21602422.

The previous prime is 21602417. The next prime is 21602431. The reversal of 21602423 is 32420612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21602423 - 2¹² = 21598327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21602395 and 21602404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21602453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801211 + 10801212.

It is an arithmetic number, because the mean of its divisors is an integer number (10801212).

Almost surely, 2^21602423 is an apocalyptic number.

21602423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21602423 is an equidigital number, since it uses as much as digits as its factorization.

21602423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21602423 is about 4647.8406814348. The cubic root of 21602423 is about 278.5057431179.

The spelling of 21602423 in words is "twenty-one million, six hundred two thousand, four hundred twenty-three".