21456126002 has 16 divisors (see below), whose sum is σ = 32258428632. Its totient is φ = 10703335680.

The previous prime is 21456126001. The next prime is 21456126059. The reversal of 21456126002 is 20062165412.

It can be written as a sum of positive squares in 4 ways, for example, as 21456097441 + 28561 = 146479^2 + 169^2 .

It is not an unprimeable number, because it can be changed into a prime (21456126001) 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, 3975818 + ... + 3981210.

Almost surely, 2^21456126002 is an apocalyptic number.

21456126002 is a deficient number, since it is larger than the sum of its proper divisors (10802302630).

21456126002 is a wasteful number, since it uses less digits than its factorization.

21456126002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9613.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21456126002 in words is "twenty-one billion, four hundred fifty-six million, one hundred twenty-six thousand, two".