21002102222201 has 32 divisors (see below), whose sum is σ = 21486513108480. Its totient is φ = 20522823552000.

The previous prime is 21002102222177. The next prime is 21002102222203. The reversal of 21002102222201 is 10222220120012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21002102222201 - 2³⁸ = 20727224315257 is a prime.

It is a super-3 number, since 3×21002102222201³ (a number of 41 digits) contains 333 as substring.

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 21002102222201.

It is not an unprimeable number, because it can be changed into a prime (21002102222203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7112122541 + ... + 7112125493.

It is an arithmetic number, because the mean of its divisors is an integer number (671453534640).

Almost surely, 2^{21002102222201} is an apocalyptic number.

It is an amenable number.

21002102222201 is a deficient number, since it is larger than the sum of its proper divisors (484410886279).

21002102222201 is a wasteful number, since it uses less digits than its factorization.

21002102222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4497.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21002102222201 its reverse (10222220120012), we get a palindrome (31224322342213).

The spelling of 21002102222201 in words is "twenty-one trillion, two billion, one hundred two million, two hundred twenty-two thousand, two hundred one".