21120100022251 has 2 divisors, whose sum is σ = 21120100022252. Its totient is φ = 21120100022250.

The previous prime is 21120100022183. The next prime is 21120100022339. The reversal of 21120100022251 is 15222000102112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120100022251 - 2¹⁷ = 21120099891179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120100022051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560050011125 + 10560050011126.

It is an arithmetic number, because the mean of its divisors is an integer number (10560050011126).

Almost surely, 2^{21120100022251} is an apocalyptic number.

21120100022251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120100022251 is an equidigital number, since it uses as much as digits as its factorization.

21120100022251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 21120100022251 its reverse (15222000102112), we get a palindrome (36342100124363).

The spelling of 21120100022251 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, twenty-two thousand, two hundred fifty-one".