21012022201 has 2 divisors, whose sum is σ = 21012022202. Its totient is φ = 21012022200.

The previous prime is 21012022189. The next prime is 21012022243. The reversal of 21012022201 is 10222021012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18377869225 + 2634152976 = 135565^2 + 51324^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012022201 - 2⁹ = 21012021689 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012022261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506011100 + 10506011101.

It is an arithmetic number, because the mean of its divisors is an integer number (10506011101).

Almost surely, 2^21012022201 is an apocalyptic number.

It is an amenable number.

21012022201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012022201 is an equidigital number, since it uses as much as digits as its factorization.

21012022201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21012022201 its reverse (10222021012), we get a palindrome (31234043213).

The spelling of 21012022201 in words is "twenty-one billion, twelve million, twenty-two thousand, two hundred one".