2101697280 has 432 divisors, whose sum is σ = 7834488480. Its totient is φ = 538804224.

The previous prime is 2101697263. The next prime is 2101697287. The reversal of 2101697280 is 827961012.

2101697280 is a `hidden beast` number, since 210 + 169 + 7 + 280 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2101697287) 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, 9020044 + ... + 9020276.

It is an arithmetic number, because the mean of its divisors is an integer number (18135390).

Almost surely, 2^2101697280 is an apocalyptic number.

2101697280 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 2101697280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3917244240).

2101697280 is an abundant number, since it is smaller than the sum of its proper divisors (5732791200).

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

2101697280 is an equidigital number, since it uses as much as digits as its factorization.

2101697280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 2101697280 is about 45844.2720522423. The cubic root of 2101697280 is about 1280.9240723059.

The spelling of 2101697280 in words is "two billion, one hundred one million, six hundred ninety-seven thousand, two hundred eighty".