21011211203 has 8 divisors (see below), whose sum is σ = 21310522368. Its totient is φ = 20712210624.

The previous prime is 21011211187. The next prime is 21011211241. The reversal of 21011211203 is 30211211012.

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 21011211203 - 2⁴ = 21011211187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011211253) 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, 60350 + ... + 213692.

It is an arithmetic number, because the mean of its divisors is an integer number (2663815296).

Almost surely, 2^21011211203 is an apocalyptic number.

21011211203 is a deficient number, since it is larger than the sum of its proper divisors (299311165).

21011211203 is a wasteful number, since it uses less digits than its factorization.

21011211203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155293.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21011211203 its reverse (30211211012), we get a palindrome (51222422215).

The spelling of 21011211203 in words is "twenty-one billion, eleven million, two hundred eleven thousand, two hundred three".