21021131103 has 8 divisors (see below), whose sum is σ = 32032199808. Its totient is φ = 12012074904.

The previous prime is 21021131077. The next prime is 21021131113. The reversal of 21021131103 is 30113112012.

It is a happy number.

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

It is not a de Polignac number, because 21021131103 - 2⁵ = 21021131071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021131113) 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, 500503101 + ... + 500503142.

It is an arithmetic number, because the mean of its divisors is an integer number (4004024976).

Almost surely, 2^21021131103 is an apocalyptic number.

21021131103 is a deficient number, since it is larger than the sum of its proper divisors (11011068705).

21021131103 is a wasteful number, since it uses less digits than its factorization.

21021131103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001006253.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21021131103 its reverse (30113112012), we get a palindrome (51134243115).

The spelling of 21021131103 in words is "twenty-one billion, twenty-one million, one hundred thirty-one thousand, one hundred three".