2154681534820 has 24 divisors (see below), whose sum is σ = 4528319967864. Its totient is φ = 861208091136.

The previous prime is 2154681534787. The next prime is 2154681534823. The reversal of 2154681534820 is 284351864512.

It can be written as a sum of positive squares in 4 ways, for example, as 608359440676 + 1546322094144 = 779974^2 + 1243512^2 .

It is not an unprimeable number, because it can be changed into a prime (2154681534823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41506087 + ... + 41557966.

It is an arithmetic number, because the mean of its divisors is an integer number (188679998661).

Almost surely, 2^{2154681534820} is an apocalyptic number.

2154681534820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154681534820 is an abundant number, since it is smaller than the sum of its proper divisors (2373638433044).

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

2154681534820 is a wasteful number, since it uses less digits than its factorization.

2154681534820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83065359 (or 83065357 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 49.

The spelling of 2154681534820 in words is "two trillion, one hundred fifty-four billion, six hundred eighty-one million, five hundred thirty-four thousand, eight hundred twenty".