10020002121 has 6 divisors (see below), whose sum is σ = 14473336410. Its totient is φ = 6680001408.

The previous prime is 10020002107. The next prime is 10020002123. The reversal of 10020002121 is 12120002001.

It can be written as a sum of positive squares in only one way, i.e., 5149497600 + 4870504521 = 71760^2 + 69789^2 .

It is not a de Polignac number, because 10020002121 - 2⁷ = 10020001993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1113333569 = 10020002121 / (1 + 0 + 0 + 2 + 0 + 0 + 0 + 2 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (10020002123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 556666776 + ... + 556666793.

It is an arithmetic number, because the mean of its divisors is an integer number (2412222735).

Almost surely, 2^10020002121 is an apocalyptic number.

It is an amenable number.

10020002121 is a deficient number, since it is larger than the sum of its proper divisors (4453334289).

10020002121 is a wasteful number, since it uses less digits than its factorization.

10020002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113333575 (or 1113333572 counting only the distinct ones).

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

Adding to 10020002121 its reverse (12120002001), we get a palindrome (22140004122).

The spelling of 10020002121 in words is "ten billion, twenty million, two thousand, one hundred twenty-one".