21243002 has 24 divisors (see below), whose sum is σ = 35895636. Its totient is φ = 9416000.

The previous prime is 21242999. The next prime is 21243011. The reversal of 21243002 is 20034212.

It can be written as a sum of positive squares in 2 ways, for example, as 21242881 + 121 = 4609^2 + 11^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8852 + ... + 10992.

Almost surely, 2^21243002 is an apocalyptic number.

21243002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21243002 is a deficient number, since it is larger than the sum of its proper divisors (14652634).

21243002 is a wasteful number, since it uses less digits than its factorization.

21243002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206 (or 2195 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21243002 is about 4609.0131264730. The cubic root of 21243002 is about 276.9525043791.

Adding to 21243002 its reverse (20034212), we get a palindrome (41277214).

The spelling of 21243002 in words is "twenty-one million, two hundred forty-three thousand, two".