21033021127 has 2 divisors, whose sum is σ = 21033021128. Its totient is φ = 21033021126.

The previous prime is 21033021091. The next prime is 21033021131. The reversal of 21033021127 is 72112033012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21033021127 - 2³¹ = 18885537479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21033021098 and 21033021107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033025127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516510563 + 10516510564.

It is an arithmetic number, because the mean of its divisors is an integer number (10516510564).

Almost surely, 2^21033021127 is an apocalyptic number.

21033021127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033021127 is an equidigital number, since it uses as much as digits as its factorization.

21033021127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 21033021127 its reverse (72112033012), we get a palindrome (93145054139).

The spelling of 21033021127 in words is "twenty-one billion, thirty-three million, twenty-one thousand, one hundred twenty-seven".