71435857921 has 8 divisors (see below), whose sum is σ = 73108859040. Its totient is φ = 69782198112.

The previous prime is 71435857907. The next prime is 71435857967. The reversal of 71435857921 is 12975853417.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71435857921 - 2¹⁷ = 71435726849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71435857901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4827855 + ... + 4842628.

It is an arithmetic number, because the mean of its divisors is an integer number (9138607380).

Almost surely, 2^71435857921 is an apocalyptic number.

It is an amenable number.

71435857921 is a deficient number, since it is larger than the sum of its proper divisors (1673001119).

71435857921 is an equidigital number, since it uses as much as digits as its factorization.

71435857921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9670655.

The product of its digits is 2116800, while the sum is 52.

The spelling of 71435857921 in words is "seventy-one billion, four hundred thirty-five million, eight hundred fifty-seven thousand, nine hundred twenty-one".