2101531400 has 48 divisors (see below), whose sum is σ = 5054559300. Its totient is φ = 811623680.

The previous prime is 2101531391. The next prime is 2101531403. The reversal of 2101531400 is 41351012.

It can be written as a sum of positive squares in 6 ways, for example, as 537961636 + 1563569764 = 23194^2 + 39542^2 .

It is not an unprimeable number, because it can be changed into a prime (2101531403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175367 + ... + 186966.

Almost surely, 2^2101531400 is an apocalyptic number.

2101531400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101531400 is an abundant number, since it is smaller than the sum of its proper divisors (2953027900).

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

2101531400 is a wasteful number, since it uses less digits than its factorization.

2101531400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362378 (or 362369 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2101531400 is about 45842.4628483244. The cubic root of 2101531400 is about 1280.8903717222.

Adding to 2101531400 its reverse (41351012), we get a palindrome (2142882412).

The spelling of 2101531400 in words is "two billion, one hundred one million, five hundred thirty-one thousand, four hundred".