31454663143021 has 4 divisors (see below), whose sum is σ = 31454839568700. Its totient is φ = 31454486717344.

The previous prime is 31454663143019. The next prime is 31454663143037. The reversal of 31454663143021 is 12034136645413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9790572162121 + 21664090980900 = 3128989^2 + 4654470^2 .

It is a cyclic number.

It is not a de Polignac number, because 31454663143021 - 2¹ = 31454663143019 is a prime.

It is a super-3 number, since 3×31454663143021³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31454663143081) 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, 87945136 + ... + 88302073.

It is an arithmetic number, because the mean of its divisors is an integer number (7863709892175).

Almost surely, 2^{31454663143021} is an apocalyptic number.

It is an amenable number.

31454663143021 is a deficient number, since it is larger than the sum of its proper divisors (176425679).

31454663143021 is a wasteful number, since it uses less digits than its factorization.

31454663143021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176425678.

The product of its (nonzero) digits is 622080, while the sum is 43.

Adding to 31454663143021 its reverse (12034136645413), we get a palindrome (43488799788434).

The spelling of 31454663143021 in words is "thirty-one trillion, four hundred fifty-four billion, six hundred sixty-three million, one hundred forty-three thousand, twenty-one".