10001022021 has 16 divisors (see below), whose sum is σ = 15687878400. Its totient is φ = 6275150784.

The previous prime is 10001022013. The next prime is 10001022023. The reversal of 10001022021 is 12022010001.

It is not a de Polignac number, because 10001022021 - 2³ = 10001022013 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10001021994 and 10001022012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001022023) 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, 10893901 + ... + 10894818.

It is an arithmetic number, because the mean of its divisors is an integer number (980492400).

Almost surely, 2^10001022021 is an apocalyptic number.

It is an amenable number.

10001022021 is a deficient number, since it is larger than the sum of its proper divisors (5686856379).

10001022021 is a wasteful number, since it uses less digits than its factorization.

10001022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21788745 (or 21788739 counting only the distinct ones).

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

Adding to 10001022021 its reverse (12022010001), we get a palindrome (22023032022).

The spelling of 10001022021 in words is "ten billion, one million, twenty-two thousand, twenty-one".