21002220011203 has 4 divisors (see below), whose sum is σ = 21002232144600. Its totient is φ = 21002207877808.

The previous prime is 21002220011189. The next prime is 21002220011341. The reversal of 21002220011203 is 30211002220012.

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 21002220011203 - 2⁹ = 21002220010691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002220411203) 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, 2929525 + ... + 7112422.

It is an arithmetic number, because the mean of its divisors is an integer number (5250558036150).

Almost surely, 2^{21002220011203} is an apocalyptic number.

21002220011203 is a deficient number, since it is larger than the sum of its proper divisors (12133397).

21002220011203 is a wasteful number, since it uses less digits than its factorization.

21002220011203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12133396.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21002220011203 its reverse (30211002220012), we get a palindrome (51213222231215).

The spelling of 21002220011203 in words is "twenty-one trillion, two billion, two hundred twenty million, eleven thousand, two hundred three".