2121121554 has 16 divisors (see below), whose sum is σ = 4243002048. Its totient is φ = 706914032.

The previous prime is 2121121537. The next prime is 2121121573. The reversal of 2121121554 is 4551211212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8659 + ... + 65705.

It is an arithmetic number, because the mean of its divisors is an integer number (265187628).

Almost surely, 2^2121121554 is an apocalyptic number.

2121121554 is an abundant number, since it is smaller than the sum of its proper divisors (2121880494).

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

2121121554 is a wasteful number, since it uses less digits than its factorization.

2121121554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63249.

The product of its digits is 800, while the sum is 24.

The square root of 2121121554 is about 46055.6354206518. The cubic root of 2121121554 is about 1284.8581561046.

Adding to 2121121554 its reverse (4551211212), we get a palindrome (6672332766).

The spelling of 2121121554 in words is "two billion, one hundred twenty-one million, one hundred twenty-one thousand, five hundred fifty-four".