2150821720 has 16 divisors (see below), whose sum is σ = 4839348960. Its totient is φ = 860328672.

The previous prime is 2150821711. The next prime is 2150821727. The reversal of 2150821720 is 271280512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2150821727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26885232 + ... + 26885311.

It is an arithmetic number, because the mean of its divisors is an integer number (302459310).

Almost surely, 2^2150821720 is an apocalyptic number.

2150821720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2150821720 is an abundant number, since it is smaller than the sum of its proper divisors (2688527240).

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

2150821720 is a wasteful number, since it uses less digits than its factorization.

2150821720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53770554 (or 53770550 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 2150821720 is about 46376.9524656375. The cubic root of 2150821720 is about 1290.8272881805.

The spelling of 2150821720 in words is "two billion, one hundred fifty million, eight hundred twenty-one thousand, seven hundred twenty".