71403201271621 has 4 divisors (see below), whose sum is σ = 72035088008652. Its totient is φ = 70771314534592.

The previous prime is 71403201271613. The next prime is 71403201271673. The reversal of 71403201271621 is 12617210230417.

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 34642759356100 + 36760441915521 = 5885810^2 + 6063039^2 .

It is a cyclic number.

It is not a de Polignac number, because 71403201271621 - 2³ = 71403201271613 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 (71403201275621) 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, 315943368346 + ... + 315943368571.

It is an arithmetic number, because the mean of its divisors is an integer number (18008772002163).

Almost surely, 2^{71403201271621} is an apocalyptic number.

It is an amenable number.

71403201271621 is a deficient number, since it is larger than the sum of its proper divisors (631886737031).

71403201271621 is a wasteful number, since it uses less digits than its factorization.

71403201271621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631886737030.

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 71403201271621 in words is "seventy-one trillion, four hundred three billion, two hundred one million, two hundred seventy-one thousand, six hundred twenty-one".