2154251435240 has 64 divisors (see below), whose sum is σ = 5165420751360. Its totient is φ = 806698393600.

The previous prime is 2154251435233. The next prime is 2154251435249. The reversal of 2154251435240 is 425341524512.

It is a junction number, because it is equal to n+sod(n) for n = 2154251435194 and 2154251435203.

It is not an unprimeable number, because it can be changed into a prime (2154251435249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24867161 + ... + 24953640.

It is an arithmetic number, because the mean of its divisors is an integer number (80709699240).

Almost surely, 2^{2154251435240} is an apocalyptic number.

2154251435240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154251435240 is an abundant number, since it is smaller than the sum of its proper divisors (3011169316120).

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

2154251435240 is a wasteful number, since it uses less digits than its factorization.

2154251435240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49820882 (or 49820878 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 38.

Adding to 2154251435240 its reverse (425341524512), we get a palindrome (2579592959752).

The spelling of 2154251435240 in words is "two trillion, one hundred fifty-four billion, two hundred fifty-one million, four hundred thirty-five thousand, two hundred forty".