31200023421220 has 12 divisors (see below), whose sum is σ = 65520049184604. Its totient is φ = 12480009368480.

The previous prime is 31200023421209. The next prime is 31200023421223. The reversal of 31200023421220 is 2212432000213.

It can be written as a sum of positive squares in 2 ways, for example, as 8906309110336 + 22293714310884 = 2984344^2 + 4721622^2 .

It is a super-2 number, since 2×31200023421220² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31200023421191 and 31200023421200.

It is not an unprimeable number, because it can be changed into a prime (31200023421223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780000585511 + ... + 780000585550.

It is an arithmetic number, because the mean of its divisors is an integer number (5460004098717).

Almost surely, 2^{31200023421220} is an apocalyptic number.

It is an amenable number.

31200023421220 is an abundant number, since it is smaller than the sum of its proper divisors (34320025763384).

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

31200023421220 is a wasteful number, since it uses less digits than its factorization.

31200023421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560001171070 (or 1560001171068 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31200023421220 its reverse (2212432000213), we get a palindrome (33412455421433).

The spelling of 31200023421220 in words is "thirty-one trillion, two hundred billion, twenty-three million, four hundred twenty-one thousand, two hundred twenty".