71357437024421 has 4 divisors (see below), whose sum is σ = 71383132899372. Its totient is φ = 71331741149472.

The previous prime is 71357437024411. The next prime is 71357437024507. The reversal of 71357437024421 is 12442073475317.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5063872593025 + 66293564431396 = 2250305^2 + 8142086^2 .

It is a cyclic number.

It is not a de Polignac number, because 71357437024421 - 2¹⁸ = 71357436762277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71357437024421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71357437024411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12847933310 + ... + 12847938863.

It is an arithmetic number, because the mean of its divisors is an integer number (17845783224843).

Almost surely, 2^{71357437024421} is an apocalyptic number.

It is an amenable number.

71357437024421 is a deficient number, since it is larger than the sum of its proper divisors (25695874951).

71357437024421 is a wasteful number, since it uses less digits than its factorization.

71357437024421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25695874950.

The product of its (nonzero) digits is 3951360, while the sum is 50.

The spelling of 71357437024421 in words is "seventy-one trillion, three hundred fifty-seven billion, four hundred thirty-seven million, twenty-four thousand, four hundred twenty-one".