12000021021 has 16 divisors (see below), whose sum is σ = 17790220800. Its totient is φ = 7994428704.

The previous prime is 12000020953. The next prime is 12000021031. The reversal of 12000021021 is 12012000021.

It is not a de Polignac number, because 12000021021 - 2¹⁴ = 12000004637 is a prime.

It is a super-3 number, since 3×12000021021³ (a number of 31 digits) contains 333 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 = 12000020994 and 12000021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000021031) 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, 115576 + ... + 193281.

It is an arithmetic number, because the mean of its divisors is an integer number (1111888800).

Almost surely, 2^12000021021 is an apocalyptic number.

It is an amenable number.

12000021021 is a deficient number, since it is larger than the sum of its proper divisors (5790199779).

12000021021 is a wasteful number, since it uses less digits than its factorization.

12000021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310305 (or 310299 counting only the distinct ones).

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

Adding to 12000021021 its reverse (12012000021), we get a palindrome (24012021042).

The spelling of 12000021021 in words is "twelve billion, twenty-one thousand, twenty-one".