21872603 has 2 divisors, whose sum is σ = 21872604. Its totient is φ = 21872602.

The previous prime is 21872597. The next prime is 21872611. The reversal of 21872603 is 30627812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21872603 - 2¹⁶ = 21807067 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21872663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10936301 + 10936302.

It is an arithmetic number, because the mean of its divisors is an integer number (10936302).

Almost surely, 2^21872603 is an apocalyptic number.

21872603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21872603 is an equidigital number, since it uses as much as digits as its factorization.

21872603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21872603 is about 4676.8154763685. The cubic root of 21872603 is about 279.6620199190.

The spelling of 21872603 in words is "twenty-one million, eight hundred seventy-two thousand, six hundred three".