21122102201 has 4 divisors (see below), whose sum is σ = 21156336372. Its totient is φ = 21087868032.

The previous prime is 21122102189. The next prime is 21122102213. The reversal of 21122102201 is 10220122112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21122102189) and next prime (21122102213).

It can be written as a sum of positive squares in 2 ways, for example, as 7203765625 + 13918336576 = 84875^2 + 117976^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122102201 - 2¹⁸ = 21121840057 is a prime.

It is a super-2 number, since 2×21122102201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122102801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17116160 + ... + 17117393.

It is an arithmetic number, because the mean of its divisors is an integer number (5289084093).

Almost surely, 2^21122102201 is an apocalyptic number.

It is an amenable number.

21122102201 is a deficient number, since it is larger than the sum of its proper divisors (34234171).

21122102201 is an equidigital number, since it uses as much as digits as its factorization.

21122102201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34234170.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21122102201 its reverse (10220122112), we get a palindrome (31342224313).

The spelling of 21122102201 in words is "twenty-one billion, one hundred twenty-two million, one hundred two thousand, two hundred one".