31354241721 has 16 divisors (see below), whose sum is σ = 47178797760. Its totient is φ = 18347309120.

The previous prime is 31354241717. The next prime is 31354241747. The reversal of 31354241721 is 12714245313.

It is a cyclic number.

It is not a de Polignac number, because 31354241721 - 2² = 31354241717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (31354240721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16380570 + ... + 16382483.

It is an arithmetic number, because the mean of its divisors is an integer number (2948674860).

Almost surely, 2^31354241721 is an apocalyptic number.

It is an amenable number.

31354241721 is a deficient number, since it is larger than the sum of its proper divisors (15824556039).

31354241721 is a wasteful number, since it uses less digits than its factorization.

31354241721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32763096.

The product of its digits is 20160, while the sum is 33.

The spelling of 31354241721 in words is "thirty-one billion, three hundred fifty-four million, two hundred forty-one thousand, seven hundred twenty-one".