21022516201 has 2 divisors, whose sum is σ = 21022516202. Its totient is φ = 21022516200.

The previous prime is 21022516171. The next prime is 21022516211. The reversal of 21022516201 is 10261522012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17340939225 + 3681576976 = 131685^2 + 60676^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022516201 - 2⁵ = 21022516169 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022516211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511258100 + 10511258101.

It is an arithmetic number, because the mean of its divisors is an integer number (10511258101).

Almost surely, 2^21022516201 is an apocalyptic number.

It is an amenable number.

21022516201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022516201 is an equidigital number, since it uses as much as digits as its factorization.

21022516201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The spelling of 21022516201 in words is "twenty-one billion, twenty-two million, five hundred sixteen thousand, two hundred one".