9910020021 has 16 divisors (see below), whose sum is σ = 14440204800. Its totient is φ = 5995393520.

The previous prime is 9910020013. The next prime is 9910020089. The reversal of 9910020021 is 1200200199.

It is a cyclic number.

It is not a de Polignac number, because 9910020021 - 2³ = 9910020013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9910019973 and 9910020000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9910020121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248121 + ... + 285278.

It is an arithmetic number, because the mean of its divisors is an integer number (902512800).

Almost surely, 2^9910020021 is an apocalyptic number.

It is an amenable number.

9910020021 is a deficient number, since it is larger than the sum of its proper divisors (4530184779).

9910020021 is a wasteful number, since it uses less digits than its factorization.

9910020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533976.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 9910020021 is about 99549.0834764439. The cubic root of 9910020021 is about 2147.9533450034.

The spelling of 9910020021 in words is "nine billion, nine hundred ten million, twenty thousand, twenty-one".