21013021003 has 8 divisors (see below), whose sum is σ = 23960549088. Its totient is φ = 18255656064.

The previous prime is 21013020913. The next prime is 21013021009. The reversal of 21013021003 is 30012031012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013021003 - 2³³ = 12423086411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (21013021009) 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, 47540551 + ... + 47540992.

It is an arithmetic number, because the mean of its divisors is an integer number (2995068636).

Almost surely, 2^21013021003 is an apocalyptic number.

21013021003 is a deficient number, since it is larger than the sum of its proper divisors (2947528085).

21013021003 is a wasteful number, since it uses less digits than its factorization.

21013021003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95081573.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21013021003 its reverse (30012031012), we get a palindrome (51025052015).

The spelling of 21013021003 in words is "twenty-one billion, thirteen million, twenty-one thousand, three".