71023061621 has 8 divisors (see below), whose sum is σ = 71299437624. Its totient is φ = 70747015360.

The previous prime is 71023061563. The next prime is 71023061633. The reversal of 71023061621 is 12616032017.

It can be written as a sum of positive squares in 4 ways, for example, as 1688799025 + 69334262596 = 41095^2 + 263314^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71023061621 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 (71023064621) 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, 353651 + ... + 516831.

It is an arithmetic number, because the mean of its divisors is an integer number (8912429703).

Almost surely, 2^71023061621 is an apocalyptic number.

It is an amenable number.

71023061621 is a deficient number, since it is larger than the sum of its proper divisors (276376003).

71023061621 is a wasteful number, since it uses less digits than its factorization.

71023061621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164871.

The product of its (nonzero) digits is 3024, while the sum is 29.

Adding to 71023061621 its reverse (12616032017), we get a palindrome (83639093638).

The spelling of 71023061621 in words is "seventy-one billion, twenty-three million, sixty-one thousand, six hundred twenty-one".