21213012003 has 8 divisors (see below), whose sum is σ = 28289350848. Its totient is φ = 14139340584.

The previous prime is 21213011999. The next prime is 21213012011. The reversal of 21213012003 is 30021031212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21213012003 - 2² = 21213011999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21213014003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648225 + ... + 680162.

It is an arithmetic number, because the mean of its divisors is an integer number (3536168856).

Almost surely, 2^21213012003 is an apocalyptic number.

21213012003 is a deficient number, since it is larger than the sum of its proper divisors (7076338845).

21213012003 is a wasteful number, since it uses less digits than its factorization.

21213012003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333713.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21213012003 its reverse (30021031212), we get a palindrome (51234043215).

The spelling of 21213012003 in words is "twenty-one billion, two hundred thirteen million, twelve thousand, three".