2121754680242 has 6 divisors (see below), whose sum is σ = 3182635110333. Its totient is φ = 1060876310132.

The previous prime is 2121754680233. The next prime is 2121754680319. The reversal of 2121754680242 is 2420864571212.

It can be written as a sum of positive squares in 2 ways, for example, as 2094963865201 + 26790815041 = 1447399^2 + 163679^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1029989.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121754680193 and 2121754680202.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1544984 + ... + 2574972.

Almost surely, 2^{2121754680242} is an apocalyptic number.

2121754680242 is a deficient number, since it is larger than the sum of its proper divisors (1060880430091).

2121754680242 is an frugal number, since it uses more digits than its factorization.

2121754680242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059980 (or 1029991 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 44.

The spelling of 2121754680242 in words is "two trillion, one hundred twenty-one billion, seven hundred fifty-four million, six hundred eighty thousand, two hundred forty-two".