21152003 has 2 divisors, whose sum is σ = 21152004. Its totient is φ = 21152002.

The previous prime is 21151981. The next prime is 21152009. The reversal of 21152003 is 30025112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21152003 - 2⁸ = 21151747 is a prime.

It is not a weakly prime, because it can be changed into another prime (21152009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576001 + 10576002.

It is an arithmetic number, because the mean of its divisors is an integer number (10576002).

Almost surely, 2^21152003 is an apocalyptic number.

21152003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152003 is an equidigital number, since it uses as much as digits as its factorization.

21152003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21152003 is about 4599.1306787261. The cubic root of 21152003 is about 276.5564763368.

Adding to 21152003 its reverse (30025112), we get a palindrome (51177115).

The spelling of 21152003 in words is "twenty-one million, one hundred fifty-two thousand, three".