71109070421 has 4 divisors (see below), whose sum is σ = 71110585644. Its totient is φ = 71107555200.

The previous prime is 71109070387. The next prime is 71109070429. The reversal of 71109070421 is 12407090117.

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 54023704900 + 17085365521 = 232430^2 + 130711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71109070421 is a prime.

It is a super-2 number, since 2×71109070421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71109070429) 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, 684890 + ... + 781851.

It is an arithmetic number, because the mean of its divisors is an integer number (17777646411).

Almost surely, 2^71109070421 is an apocalyptic number.

It is an amenable number.

71109070421 is a deficient number, since it is larger than the sum of its proper divisors (1515223).

71109070421 is a wasteful number, since it uses less digits than its factorization.

71109070421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515222.

The product of its (nonzero) digits is 3528, while the sum is 32.

The spelling of 71109070421 in words is "seventy-one billion, one hundred nine million, seventy thousand, four hundred twenty-one".