21130221233 has 16 divisors (see below), whose sum is σ = 25319347200. Its totient is φ = 17407043280.

The previous prime is 21130221227. The next prime is 21130221241. The reversal of 21130221233 is 33212203112.

It is not a de Polignac number, because 21130221233 - 2⁸ = 21130220977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130221253) 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, 2193053 + ... + 2202666.

It is an arithmetic number, because the mean of its divisors is an integer number (1582459200).

Almost surely, 2^21130221233 is an apocalyptic number.

21130221233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21130221233 is a deficient number, since it is larger than the sum of its proper divisors (4189125967).

21130221233 is a wasteful number, since it uses less digits than its factorization.

21130221233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4395772.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21130221233 its reverse (33212203112), we get a palindrome (54342424345).

The spelling of 21130221233 in words is "twenty-one billion, one hundred thirty million, two hundred twenty-one thousand, two hundred thirty-three".