31220400200440 has 32 divisors (see below), whose sum is σ = 76631891402160. Its totient is φ = 11352872800000.

The previous prime is 31220400200419. The next prime is 31220400200459. The reversal of 31220400200440 is 4400200402213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 35477727061 + ... + 35477727940.

Almost surely, 2^{31220400200440} is an apocalyptic number.

It is an amenable number.

31220400200440 is an abundant number, since it is smaller than the sum of its proper divisors (45411491201720).

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

31220400200440 is a wasteful number, since it uses less digits than its factorization.

31220400200440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70955455023 (or 70955455019 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 31220400200440 its reverse (4400200402213), we get a palindrome (35620600602653).

The spelling of 31220400200440 in words is "thirty-one trillion, two hundred twenty billion, four hundred million, two hundred thousand, four hundred forty".