31540212021 has 8 divisors (see below), whose sum is σ = 44266964320. Its totient is φ = 19920133872.

The previous prime is 31540212019. The next prime is 31540212049. The reversal of 31540212021 is 12021204513.

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

It is not a de Polignac number, because 31540212021 - 2¹ = 31540212019 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 (31540212001) 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, 276668470 + ... + 276668583.

It is an arithmetic number, because the mean of its divisors is an integer number (5533370540).

Almost surely, 2^31540212021 is an apocalyptic number.

It is an amenable number.

31540212021 is a deficient number, since it is larger than the sum of its proper divisors (12726752299).

31540212021 is a wasteful number, since it uses less digits than its factorization.

31540212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553337075.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 31540212021 its reverse (12021204513), we get a palindrome (43561416534).

The spelling of 31540212021 in words is "thirty-one billion, five hundred forty million, two hundred twelve thousand, twenty-one".