2101004400 has 120 divisors (see below), whose sum is σ = 7342101504. Its totient is φ = 509331200.

The previous prime is 2101004371. The next prime is 2101004407. The reversal of 2101004400 is 44001012.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101004407) 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, 66384 + ... + 92783.

Almost surely, 2^2101004400 is an apocalyptic number.

2101004400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101004400 is an abundant number, since it is smaller than the sum of its proper divisors (5241097104).

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

2101004400 is a wasteful number, since it uses less digits than its factorization.

2101004400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159199 (or 159188 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2101004400 is about 45836.7145419477. The cubic root of 2101004400 is about 1280.7832933539.

Adding to 2101004400 its reverse (44001012), we get a palindrome (2145005412).

The spelling of 2101004400 in words is "two billion, one hundred one million, four thousand, four hundred".