71211421 has 8 divisors (see below), whose sum is σ = 73632600. Its totient is φ = 68816448.

The previous prime is 71211409. The next prime is 71211431. The reversal of 71211421 is 12411217.

It can be written as a sum of positive squares in 4 ways, for example, as 12152196 + 59059225 = 3486^2 + 7685^2 .

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

It is not a de Polignac number, because 71211421 - 2²³ = 62822813 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 (71211401) 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, 946 + ... + 11971.

It is an arithmetic number, because the mean of its divisors is an integer number (9204075).

Almost surely, 2^71211421 is an apocalyptic number.

It is an amenable number.

71211421 is a deficient number, since it is larger than the sum of its proper divisors (2421179).

71211421 is a wasteful number, since it uses less digits than its factorization.

71211421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13103.

The product of its digits is 112, while the sum is 19.

The square root of 71211421 is about 8438.6859759088. The cubic root of 71211421 is about 414.4923797771.

Adding to 71211421 its reverse (12411217), we get a palindrome (83622638).

The spelling of 71211421 in words is "seventy-one million, two hundred eleven thousand, four hundred twenty-one".