21424530365 has 8 divisors (see below), whose sum is σ = 29382213120. Its totient is φ = 14691106512.

The previous prime is 21424530343. The next prime is 21424530371. The reversal of 21424530365 is 56303542412.

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 21424530365 - 2¹² = 21424526269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 612129439 = 21424530365 / (2 + 1 + 4 + 2 + 4 + 5 + 3 + 0 + 3 + 6 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306064685 + ... + 306064754.

It is an arithmetic number, because the mean of its divisors is an integer number (3672776640).

Almost surely, 2^21424530365 is an apocalyptic number.

It is an amenable number.

21424530365 is a deficient number, since it is larger than the sum of its proper divisors (7957682755).

21424530365 is an equidigital number, since it uses as much as digits as its factorization.

21424530365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612129451.

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 21424530365 in words is "twenty-one billion, four hundred twenty-four million, five hundred thirty thousand, three hundred sixty-five".