2157099909120 has 768 divisors, whose sum is σ = 8123970254400. Its totient is φ = 526311751680.

The previous prime is 2157099909101. The next prime is 2157099909127. The reversal of 2157099909120 is 219099907512.

It is a tau number, because it is divible by the number of its divisors (768).

It is not an unprimeable number, because it can be changed into a prime (2157099909127) 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, 2511175251 + ... + 2511176109.

Almost surely, 2^{2157099909120} is an apocalyptic number.

2157099909120 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 2157099909120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4061985127200).

2157099909120 is an abundant number, since it is smaller than the sum of its proper divisors (5966870345280).

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

2157099909120 is a wasteful number, since it uses less digits than its factorization.

2157099909120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 54.

The spelling of 2157099909120 in words is "two trillion, one hundred fifty-seven billion, ninety-nine million, nine hundred nine thousand, one hundred twenty".