712211621 has 4 divisors (see below), whose sum is σ = 776958144. Its totient is φ = 647465100.

The previous prime is 712211603. The next prime is 712211659. The reversal of 712211621 is 126112217.

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 a de Polignac number, because none of the positive numbers 2^k-712211621 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 (712211671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32373245 + ... + 32373266.

It is an arithmetic number, because the mean of its divisors is an integer number (194239536).

Almost surely, 2^712211621 is an apocalyptic number.

It is an amenable number.

712211621 is a deficient number, since it is larger than the sum of its proper divisors (64746523).

712211621 is a wasteful number, since it uses less digits than its factorization.

712211621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64746522.

The product of its digits is 336, while the sum is 23.

The square root of 712211621 is about 26687.2932497846. The cubic root of 712211621 is about 893.0374779399.

Adding to 712211621 its reverse (126112217), we get a palindrome (838323838).

The spelling of 712211621 in words is "seven hundred twelve million, two hundred eleven thousand, six hundred twenty-one".