2131020223400 has 48 divisors (see below), whose sum is σ = 4955009970300. Its totient is φ = 852341345280.

The previous prime is 2131020223363. The next prime is 2131020223411. The reversal of 2131020223400 is 43220201312.

It can be written as a sum of positive squares in 6 ways, for example, as 722578202116 + 1408442021284 = 850046^2 + 1186778^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2183936 + ... + 3005264.

Almost surely, 2^{2131020223400} is an apocalyptic number.

2131020223400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131020223400 is an abundant number, since it is smaller than the sum of its proper divisors (2823989746900).

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

2131020223400 is a wasteful number, since it uses less digits than its factorization.

2131020223400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834318 (or 834309 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 2131020223400 its reverse (43220201312), we get a palindrome (2174240424712).

The spelling of 2131020223400 in words is "two trillion, one hundred thirty-one billion, twenty million, two hundred twenty-three thousand, four hundred".