2157266947920 has 1440 divisors, whose sum is σ = 8836702200576. Its totient is φ = 432436838400.

The previous prime is 2157266947909. The next prime is 2157266947931. The reversal of 2157266947920 is 297496627512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2157266947909) and next prime (2157266947931).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 5124149310 + ... + 5124149730.

Almost surely, 2^{2157266947920} is an apocalyptic number.

2157266947920 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 2157266947920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4418351100288).

2157266947920 is an abundant number, since it is smaller than the sum of its proper divisors (6679435252656).

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

2157266947920 is a wasteful number, since it uses less digits than its factorization.

2157266947920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 60.

The spelling of 2157266947920 in words is "two trillion, one hundred fifty-seven billion, two hundred sixty-six million, nine hundred forty-seven thousand, nine hundred twenty".