21232243012 has 24 divisors (see below), whose sum is σ = 37940418936. Its totient is φ = 10394247168.

The previous prime is 21232243003. The next prime is 21232243013. The reversal of 21232243012 is 21034223212.

It can be written as a sum of positive squares in 4 ways, for example, as 6144051456 + 15088191556 = 78384^2 + 122834^2 .

It is not an unprimeable number, because it can be changed into a prime (21232243013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225373 + ... + 305380.

It is an arithmetic number, because the mean of its divisors is an integer number (1580850789).

Almost surely, 2^21232243012 is an apocalyptic number.

It is an amenable number.

21232243012 is a deficient number, since it is larger than the sum of its proper divisors (16708175924).

21232243012 is a wasteful number, since it uses less digits than its factorization.

21232243012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530967 (or 530965 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21232243012 its reverse (21034223212), we get a palindrome (42266466224).

The spelling of 21232243012 in words is "twenty-one billion, two hundred thirty-two million, two hundred forty-three thousand, twelve".