21424274371 has 4 divisors (see below), whose sum is σ = 21424585392. Its totient is φ = 21423963352.

The previous prime is 21424274351. The next prime is 21424274381. The reversal of 21424274371 is 17347242412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21424274371 - 2¹⁵ = 21424241603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21424274371.

It is not an unprimeable number, because it can be changed into a prime (21424274351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036 + ... + 207001.

It is an arithmetic number, because the mean of its divisors is an integer number (5356146348).

Almost surely, 2^21424274371 is an apocalyptic number.

21424274371 is a deficient number, since it is larger than the sum of its proper divisors (311021).

21424274371 is a wasteful number, since it uses less digits than its factorization.

21424274371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311020.

The product of its digits is 75264, while the sum is 37.

The spelling of 21424274371 in words is "twenty-one billion, four hundred twenty-four million, two hundred seventy-four thousand, three hundred seventy-one".