10021020021 has 48 divisors (see below), whose sum is σ = 14903561088. Its totient is φ = 6486480000.

The previous prime is 10021019993. The next prime is 10021020049. The reversal of 10021020021 is 12002012001.

It is an interprime number because it is at equal distance from previous prime (10021019993) and next prime (10021020049).

It is not a de Polignac number, because 10021020021 - 2⁵ = 10021019989 is a prime.

It is a super-2 number, since 2×10021020021² (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).

It is a junction number, because it is equal to n+sod(n) for n = 10021019985 and 10021020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021020721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14294971 + ... + 14295671.

It is an arithmetic number, because the mean of its divisors is an integer number (310490856).

Almost surely, 2^10021020021 is an apocalyptic number.

It is an amenable number.

10021020021 is a deficient number, since it is larger than the sum of its proper divisors (4882541067).

10021020021 is a wasteful number, since it uses less digits than its factorization.

10021020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082 (or 1079 counting only the distinct ones).

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

Adding to 10021020021 its reverse (12002012001), we get a palindrome (22023032022).

The spelling of 10021020021 in words is "ten billion, twenty-one million, twenty thousand, twenty-one".