21210102122201 has 8 divisors (see below), whose sum is σ = 21214471254408. Its totient is φ = 21205733328000.

The previous prime is 21210102122161. The next prime is 21210102122249. The reversal of 21210102122201 is 10222120101212.

It can be written as a sum of positive squares in 4 ways, for example, as 12939675174976 + 8270426947225 = 3597176^2 + 2875835^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210102122201 - 2²² = 21210097927897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210102122201.

It is not an unprimeable number, because it can be changed into a prime (21210102122501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152982731 + ... + 153121311.

It is an arithmetic number, because the mean of its divisors is an integer number (2651808906801).

Almost surely, 2^{21210102122201} is an apocalyptic number.

It is an amenable number.

21210102122201 is a deficient number, since it is larger than the sum of its proper divisors (4369132207).

21210102122201 is a wasteful number, since it uses less digits than its factorization.

21210102122201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169003.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21210102122201 its reverse (10222120101212), we get a palindrome (31432222223413).

The spelling of 21210102122201 in words is "twenty-one trillion, two hundred ten billion, one hundred two million, one hundred twenty-two thousand, two hundred one".