10202001221 has 4 divisors (see below), whose sum is σ = 10202306592. Its totient is φ = 10201695852.

The previous prime is 10202001179. The next prime is 10202001239. The reversal of 10202001221 is 12210020201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12210020201 = 37517 ⋅325453.

It is a cyclic number.

It is not a de Polignac number, because 10202001221 - 2²² = 10197806917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202001241) 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, 95411 + ... + 171776.

It is an arithmetic number, because the mean of its divisors is an integer number (2550576648).

Almost surely, 2^10202001221 is an apocalyptic number.

It is an amenable number.

10202001221 is a deficient number, since it is larger than the sum of its proper divisors (305371).

10202001221 is an equidigital number, since it uses as much as digits as its factorization.

10202001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305370.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10202001221 its reverse (12210020201), we get a palindrome (22412021422).

The spelling of 10202001221 in words is "ten billion, two hundred two million, one thousand, two hundred twenty-one".