21213011003 has 4 divisors (see below), whose sum is σ = 21213729408. Its totient is φ = 21212292600.

The previous prime is 21213010999. The next prime is 21213011059. The reversal of 21213011003 is 30011031212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21213011003 - 2² = 21213010999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213011063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312923 + ... + 374628.

It is an arithmetic number, because the mean of its divisors is an integer number (5303432352).

Almost surely, 2^21213011003 is an apocalyptic number.

21213011003 is a deficient number, since it is larger than the sum of its proper divisors (718405).

21213011003 is an equidigital number, since it uses as much as digits as its factorization.

21213011003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718404.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21213011003 its reverse (30011031212), we get a palindrome (51224042215).

The spelling of 21213011003 in words is "twenty-one billion, two hundred thirteen million, eleven thousand, three".