10020102021 has 6 divisors (see below), whose sum is σ = 14473480710. Its totient is φ = 6680068008.

The previous prime is 10020102017. The next prime is 10020102023. The reversal of 10020102021 is 12020102001.

It can be written as a sum of positive squares in only one way, i.e., 7432853796 + 2587248225 = 86214^2 + 50865^2 .

It is not a de Polignac number, because 10020102021 - 2² = 10020102017 is a prime.

It is a super-2 number, since 2×10020102021² (a number of 21 digits) contains 22 as substring.

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: 1113344669 = 10020102021 / (1 + 0 + 0 + 2 + 0 + 1 + 0 + 2 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 10020101994 and 10020102012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020102023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 556672326 + ... + 556672343.

It is an arithmetic number, because the mean of its divisors is an integer number (2412246785).

Almost surely, 2^10020102021 is an apocalyptic number.

It is an amenable number.

10020102021 is a deficient number, since it is larger than the sum of its proper divisors (4453378689).

10020102021 is a wasteful number, since it uses less digits than its factorization.

10020102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113344675 (or 1113344672 counting only the distinct ones).

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

Adding to 10020102021 its reverse (12020102001), we get a palindrome (22040204022).

The spelling of 10020102021 in words is "ten billion, twenty million, one hundred two thousand, twenty-one".