31211214140 has 24 divisors (see below), whose sum is σ = 66373218240. Its totient is φ = 12326453568.

The previous prime is 31211214119. The next prime is 31211214163. The reversal of 31211214140 is 4141211213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9875387 + ... + 9878546.

It is an arithmetic number, because the mean of its divisors is an integer number (2765550760).

Almost surely, 2^31211214140 is an apocalyptic number.

It is an amenable number.

31211214140 is an abundant number, since it is smaller than the sum of its proper divisors (35162004100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31211214140 is a wasteful number, since it uses less digits than its factorization.

31211214140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19754021 (or 19754019 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 31211214140 its reverse (4141211213), we get a palindrome (35352425353).

The spelling of 31211214140 in words is "thirty-one billion, two hundred eleven million, two hundred fourteen thousand, one hundred forty".