21243026132 has 24 divisors (see below), whose sum is σ = 37530181920. Its totient is φ = 10520189280.

The previous prime is 21243026131. The next prime is 21243026153. The reversal of 21243026132 is 23162034212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243026131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1445003 + ... + 1459629.

It is an arithmetic number, because the mean of its divisors is an integer number (1563757580).

Almost surely, 2^21243026132 is an apocalyptic number.

It is an amenable number.

21243026132 is a deficient number, since it is larger than the sum of its proper divisors (16287155788).

21243026132 is a wasteful number, since it uses less digits than its factorization.

21243026132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18071 (or 18069 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The spelling of 21243026132 in words is "twenty-one billion, two hundred forty-three million, twenty-six thousand, one hundred thirty-two".