747031221 has 32 divisors (see below), whose sum is σ = 1203511680. Its totient is φ = 456046848.

The previous prime is 747031141. The next prime is 747031223. The reversal of 747031221 is 122130747.

It is a happy number.

747031221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 747031221 - 2¹⁴ = 747014837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747031223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5011 + ... + 38976.

It is an arithmetic number, because the mean of its divisors is an integer number (37609740).

Almost surely, 2^747031221 is an apocalyptic number.

It is an amenable number.

747031221 is a deficient number, since it is larger than the sum of its proper divisors (456480459).

747031221 is a wasteful number, since it uses less digits than its factorization.

747031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44050 (or 44044 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 747031221 is about 27331.8718897920. The cubic root of 747031221 is about 907.3599046084.

Adding to 747031221 its reverse (122130747), we get a palindrome (869161968).

The spelling of 747031221 in words is "seven hundred forty-seven million, thirty-one thousand, two hundred twenty-one".