21374838427391 has 16 divisors (see below), whose sum is σ = 21570406384800. Its totient is φ = 21180930475392.

The previous prime is 21374838427343. The next prime is 21374838427429. The reversal of 21374838427391 is 19372483847312.

It is a happy number.

It is not a de Polignac number, because 21374838427391 - 2³⁸ = 21099960520447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374838420391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1432334456 + ... + 1432349378.

It is an arithmetic number, because the mean of its divisors is an integer number (1348150399050).

Almost surely, 2^{21374838427391} is an apocalyptic number.

21374838427391 is a deficient number, since it is larger than the sum of its proper divisors (195567957409).

21374838427391 is an frugal number, since it uses more digits than its factorization.

21374838427391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15803 (or 15505 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 62.

The spelling of 21374838427391 in words is "twenty-one trillion, three hundred seventy-four billion, eight hundred thirty-eight million, four hundred twenty-seven thousand, three hundred ninety-one".