31211204340 has 24 divisors (see below), whose sum is σ = 87391372320. Its totient is φ = 8322987808.

The previous prime is 31211204327. The next prime is 31211204351. The reversal of 31211204340 is 4340211213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260093310 + ... + 260093429.

It is an arithmetic number, because the mean of its divisors is an integer number (3641307180).

Almost surely, 2^31211204340 is an apocalyptic number.

31211204340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31211204340 is an abundant number, since it is smaller than the sum of its proper divisors (56180167980).

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

31211204340 is a wasteful number, since it uses less digits than its factorization.

31211204340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520186751 (or 520186749 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31211204340 its reverse (4340211213), we get a palindrome (35551415553).

The spelling of 31211204340 in words is "thirty-one billion, two hundred eleven million, two hundred four thousand, three hundred forty".