21150023046221 has 2 divisors, whose sum is σ = 21150023046222. Its totient is φ = 21150023046220.

The previous prime is 21150023046211. The next prime is 21150023046259. The reversal of 21150023046221 is 12264032005112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11073753675625 + 10076269370596 = 3327725^2 + 3174314^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150023046221 - 2⁶ = 21150023046157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150023046211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575011523110 + 10575011523111.

It is an arithmetic number, because the mean of its divisors is an integer number (10575011523111).

Almost surely, 2^{21150023046221} is an apocalyptic number.

It is an amenable number.

21150023046221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150023046221 is an equidigital number, since it uses as much as digits as its factorization.

21150023046221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21150023046221 in words is "twenty-one trillion, one hundred fifty billion, twenty-three million, forty-six thousand, two hundred twenty-one".