21202321011 has 16 divisors (see below), whose sum is σ = 29651556864. Its totient is φ = 13460239584.

The previous prime is 21202320991. The next prime is 21202321043. The reversal of 21202321011 is 11012320212.

It is not a de Polignac number, because 21202321011 - 2¹⁵ = 21202288243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21202321061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2026825 + ... + 2037258.

It is an arithmetic number, because the mean of its divisors is an integer number (1853222304).

Almost surely, 2^21202321011 is an apocalyptic number.

21202321011 is a deficient number, since it is larger than the sum of its proper divisors (8449235853).

21202321011 is a wasteful number, since it uses less digits than its factorization.

21202321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064170.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21202321011 its reverse (11012320212), we get a palindrome (32214641223).

The spelling of 21202321011 in words is "twenty-one billion, two hundred two million, three hundred twenty-one thousand, eleven".