210021221003 has 4 divisors (see below), whose sum is σ = 229114059288. Its totient is φ = 190928382720.

The previous prime is 210021220993. The next prime is 210021221009. The reversal of 210021221003 is 300122120012.

It is a happy number.

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 210021221003 - 2¹⁶ = 210021155467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210021221009) 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, 9546419126 + ... + 9546419147.

It is an arithmetic number, because the mean of its divisors is an integer number (57278514822).

Almost surely, 2^210021221003 is an apocalyptic number.

210021221003 is a deficient number, since it is larger than the sum of its proper divisors (19092838285).

210021221003 is a wasteful number, since it uses less digits than its factorization.

210021221003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19092838284.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 210021221003 its reverse (300122120012), we get a palindrome (510143341015).

The spelling of 210021221003 in words is "two hundred ten billion, twenty-one million, two hundred twenty-one thousand, three".