10011012021 has 20 divisors (see below), whose sum is σ = 14959651564. Its totient is φ = 6671808000.

The previous prime is 10011012017. The next prime is 10011012059. The reversal of 10011012021 is 12021011001.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3625244100 + 6385767921 = 60210^2 + 79911^2 .

It is not a de Polignac number, because 10011012021 - 2² = 10011012017 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10011011994 and 10011012012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011012521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 248661 + ... + 286101.

Almost surely, 2^10011012021 is an apocalyptic number.

It is an amenable number.

10011012021 is a deficient number, since it is larger than the sum of its proper divisors (4948639543).

10011012021 is an equidigital number, since it uses as much as digits as its factorization.

10011012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40754 (or 40745 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10011012021 its reverse (12021011001), we get a palindrome (22032023022).

The spelling of 10011012021 in words is "ten billion, eleven million, twelve thousand, twenty-one".