2157020272340 has 24 divisors (see below), whose sum is σ = 4529783432832. Its totient is φ = 862800325920.

The previous prime is 2157020272333. The next prime is 2157020272343. The reversal of 2157020272340 is 432720207512.

It is a self number, because there is not a number n which added to its sum of digits gives 2157020272340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157020272343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2129177 + ... + 2974463.

It is an arithmetic number, because the mean of its divisors is an integer number (188740976368).

Almost surely, 2^{2157020272340} is an apocalyptic number.

2157020272340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157020272340 is an abundant number, since it is smaller than the sum of its proper divisors (2372763160492).

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

2157020272340 is a wasteful number, since it uses less digits than its factorization.

2157020272340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972887 (or 972885 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 35.

Adding to 2157020272340 its reverse (432720207512), we get a palindrome (2589740479852).

The spelling of 2157020272340 in words is "two trillion, one hundred fifty-seven billion, twenty million, two hundred seventy-two thousand, three hundred forty".