2101207900 has 144 divisors (see below), whose sum is σ = 5257663488. Its totient is φ = 721728000.

The previous prime is 2101207877. The next prime is 2101207907. The reversal of 2101207900 is 97021012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101207907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1465584 + ... + 1467016.

It is an arithmetic number, because the mean of its divisors is an integer number (36511552).

Almost surely, 2^2101207900 is an apocalyptic number.

2101207900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101207900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2628831744).

2101207900 is an abundant number, since it is smaller than the sum of its proper divisors (3156455588).

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

2101207900 is a wasteful number, since it uses less digits than its factorization.

2101207900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532 (or 1525 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 2101207900 is about 45838.9343244365. The cubic root of 2101207900 is about 1280.8246435744.

Adding to 2101207900 its reverse (97021012), we get a palindrome (2198228912).

The spelling of 2101207900 in words is "two billion, one hundred one million, two hundred seven thousand, nine hundred".