21267270731 has 8 divisors (see below), whose sum is σ = 24316502784. Its totient is φ = 18220801320.

The previous prime is 21267270709. The next prime is 21267270749. The reversal of 21267270731 is 13707276212.

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 21267270731 - 2¹⁰ = 21267269707 is a prime.

It is a super-2 number, since 2×21267270731² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21267270701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674135 + ... + 704976.

It is an arithmetic number, because the mean of its divisors is an integer number (3039562848).

Almost surely, 2^21267270731 is an apocalyptic number.

21267270731 is a deficient number, since it is larger than the sum of its proper divisors (3049232053).

21267270731 is a wasteful number, since it uses less digits than its factorization.

21267270731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381321.

The product of its (nonzero) digits is 49392, while the sum is 38.

The spelling of 21267270731 in words is "twenty-one billion, two hundred sixty-seven million, two hundred seventy thousand, seven hundred thirty-one".