21371274053 has 4 divisors (see below), whose sum is σ = 21439992288. Its totient is φ = 21302555820.

The previous prime is 21371274019. The next prime is 21371274059. The reversal of 21371274053 is 35047217312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21371274053 - 2¹⁰ = 21371273029 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 (21371274059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34358651 + ... + 34359272.

It is an arithmetic number, because the mean of its divisors is an integer number (5359998072).

Almost surely, 2^21371274053 is an apocalyptic number.

It is an amenable number.

21371274053 is a deficient number, since it is larger than the sum of its proper divisors (68718235).

21371274053 is an equidigital number, since it uses as much as digits as its factorization.

21371274053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68718234.

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 21371274053 in words is "twenty-one billion, three hundred seventy-one million, two hundred seventy-four thousand, fifty-three".