10020120221 has 8 divisors (see below), whose sum is σ = 10090899000. Its totient is φ = 9949388800.

The previous prime is 10020120203. The next prime is 10020120239. The reversal of 10020120221 is 12202102001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (10020120203) and next prime (10020120239).

It can be written as a sum of positive squares in 4 ways, for example, as 705168025 + 9314952196 = 26555^2 + 96514^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10020120221 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 (10020128221) 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, 485921 + ... + 506121.

It is an arithmetic number, because the mean of its divisors is an integer number (1261362375).

Almost surely, 2^10020120221 is an apocalyptic number.

It is an amenable number.

10020120221 is a deficient number, since it is larger than the sum of its proper divisors (70778779).

10020120221 is a wasteful number, since it uses less digits than its factorization.

10020120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23679.

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

Adding to 10020120221 its reverse (12202102001), we get a palindrome (22222222222).

The spelling of 10020120221 in words is "ten billion, twenty million, one hundred twenty thousand, two hundred twenty-one".