21260426243 has 8 divisors (see below), whose sum is σ = 24299417088. Its totient is φ = 18221882184.

The previous prime is 21260426203. The next prime is 21260426251. The reversal of 21260426243 is 34262406212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21260426243 - 2⁸ = 21260425987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21260426203) 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, 2621 + ... + 206222.

It is an arithmetic number, because the mean of its divisors is an integer number (3037427136).

Almost surely, 2^21260426243 is an apocalyptic number.

21260426243 is a deficient number, since it is larger than the sum of its proper divisors (3038990845).

21260426243 is a wasteful number, since it uses less digits than its factorization.

21260426243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223393.

The product of its (nonzero) digits is 27648, while the sum is 32.

The spelling of 21260426243 in words is "twenty-one billion, two hundred sixty million, four hundred twenty-six thousand, two hundred forty-three".