10020001221 has 12 divisors (see below), whose sum is σ = 15102610848. Its totient is φ = 6389565864.

The previous prime is 10020001213. The next prime is 10020001237. The reversal of 10020001221 is 12210002001.

10020001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10020001221 - 2³ = 10020001213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020001921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24202695 + ... + 24203108.

It is an arithmetic number, because the mean of its divisors is an integer number (1258550904).

Almost surely, 2^10020001221 is an apocalyptic number.

It is an amenable number.

10020001221 is a deficient number, since it is larger than the sum of its proper divisors (5082609627).

10020001221 is a wasteful number, since it uses less digits than its factorization.

10020001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48405832 (or 48405829 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10020001221 its reverse (12210002001), we get a palindrome (22230003222).

The spelling of 10020001221 in words is "ten billion, twenty million, one thousand, two hundred twenty-one".