21003023012 has 12 divisors (see below), whose sum is σ = 37258787916. Its totient is φ = 10357655040.

The previous prime is 21003023011. The next prime is 21003023021. The reversal of 21003023012 is 21032030012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16738149376 + 4264873636 = 129376^2 + 65306^2 .

It is a super-2 number, since 2×21003023012² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003023011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35963789 + ... + 35964372.

It is an arithmetic number, because the mean of its divisors is an integer number (3104898993).

Almost surely, 2^21003023012 is an apocalyptic number.

It is an amenable number.

21003023012 is a deficient number, since it is larger than the sum of its proper divisors (16255764904).

21003023012 is a wasteful number, since it uses less digits than its factorization.

21003023012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71928238 (or 71928236 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21003023012 its reverse (21032030012), we get a palindrome (42035053024).

The spelling of 21003023012 in words is "twenty-one billion, three million, twenty-three thousand, twelve".