71152421 has 4 divisors (see below), whose sum is σ = 71196000. Its totient is φ = 71108844.

The previous prime is 71152391. The next prime is 71152423. The reversal of 71152421 is 12425117.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71152421 - 2⁶ = 71152357 is a prime.

It is a super-2 number, since 2×71152421² = 10125334028322482, which 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 (71152423) 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, 19241 + ... + 22638.

It is an arithmetic number, because the mean of its divisors is an integer number (17799000).

Almost surely, 2^71152421 is an apocalyptic number.

It is an amenable number.

71152421 is a deficient number, since it is larger than the sum of its proper divisors (43579).

71152421 is a wasteful number, since it uses less digits than its factorization.

71152421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43578.

The product of its digits is 560, while the sum is 23.

The square root of 71152421 is about 8435.1894465981. The cubic root of 71152421 is about 414.3778765743.

Adding to 71152421 its reverse (12425117), we get a palindrome (83577538).

The spelling of 71152421 in words is "seventy-one million, one hundred fifty-two thousand, four hundred twenty-one".