21083221151 has 4 divisors (see below), whose sum is σ = 21083603112. Its totient is φ = 21082839192.

The previous prime is 21083221141. The next prime is 21083221163. The reversal of 21083221151 is 15112238012.

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 21083221151 - 2⁶ = 21083221087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21083221151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083221121) 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, 90596 + ... + 224441.

It is an arithmetic number, because the mean of its divisors is an integer number (5270900778).

Almost surely, 2^21083221151 is an apocalyptic number.

21083221151 is a deficient number, since it is larger than the sum of its proper divisors (381961).

21083221151 is an equidigital number, since it uses as much as digits as its factorization.

21083221151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381960.

The product of its (nonzero) digits is 960, while the sum is 26.

Adding to 21083221151 its reverse (15112238012), we get a palindrome (36195459163).

The spelling of 21083221151 in words is "twenty-one billion, eighty-three million, two hundred twenty-one thousand, one hundred fifty-one".