32131221012 has 72 divisors (see below), whose sum is σ = 89099468640. Its totient is φ = 9682317120.

The previous prime is 32131220963. The next prime is 32131221019. The reversal of 32131221012 is 21012213123.

32131221012 is a `hidden beast` number, since 321 + 312 + 21 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32131221019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155763 + ... + 297530.

It is an arithmetic number, because the mean of its divisors is an integer number (1237492620).

Almost surely, 2^32131221012 is an apocalyptic number.

It is an amenable number.

32131221012 is an abundant number, since it is smaller than the sum of its proper divisors (56968247628).

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

32131221012 is a wasteful number, since it uses less digits than its factorization.

32131221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453493 (or 453488 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 32131221012 its reverse (21012213123), we get a palindrome (53143434135).

The spelling of 32131221012 in words is "thirty-two billion, one hundred thirty-one million, two hundred twenty-one thousand, twelve".