21133321051 has 2 divisors, whose sum is σ = 21133321052. Its totient is φ = 21133321050.

The previous prime is 21133321049. The next prime is 21133321123. The reversal of 21133321051 is 15012333112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21133321051 - 2¹ = 21133321049 is a prime.

Together with 21133321049, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21133322051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566660525 + 10566660526.

It is an arithmetic number, because the mean of its divisors is an integer number (10566660526).

Almost surely, 2^21133321051 is an apocalyptic number.

21133321051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133321051 is an equidigital number, since it uses as much as digits as its factorization.

21133321051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21133321051 its reverse (15012333112), we get a palindrome (36145654163).

The spelling of 21133321051 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty-one thousand, fifty-one".