2154121550 has 96 divisors (see below), whose sum is σ = 4801192704. Its totient is φ = 703584000.

The previous prime is 2154121513. The next prime is 2154121631. The reversal of 2154121550 is 551214512.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 615305 + ... + 618795.

It is an arithmetic number, because the mean of its divisors is an integer number (50012424).

Almost surely, 2^2154121550 is an apocalyptic number.

2154121550 is an abundant number, since it is smaller than the sum of its proper divisors (2647071154).

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

2154121550 is a wasteful number, since it uses less digits than its factorization.

2154121550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594 (or 3589 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 2154121550 is about 46412.5150148104. The cubic root of 2154121550 is about 1291.4870878106.

The spelling of 2154121550 in words is "two billion, one hundred fifty-four million, one hundred twenty-one thousand, five hundred fifty".