21003223012 has 24 divisors (see below), whose sum is σ = 38669755320. Its totient is φ = 9968567040.

The previous prime is 21003222973. The next prime is 21003223051. The reversal of 21003223012 is 21032230012.

It is an interprime number because it is at equal distance from previous prime (21003222973) and next prime (21003223051).

It can be written as a sum of positive squares in 4 ways, for example, as 7186631076 + 13816591936 = 84774^2 + 117544^2 .

It is a super-2 number, since 2×21003223012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1724587 + ... + 1736722.

It is an arithmetic number, because the mean of its divisors is an integer number (1611239805).

Almost surely, 2^21003223012 is an apocalyptic number.

It is an amenable number.

21003223012 is a deficient number, since it is larger than the sum of its proper divisors (17666532308).

21003223012 is a wasteful number, since it uses less digits than its factorization.

21003223012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3461391 (or 3461389 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21003223012 its reverse (21032230012), we get a palindrome (42035453024).

The spelling of 21003223012 in words is "twenty-one billion, three million, two hundred twenty-three thousand, twelve".