1491020122121 has 8 divisors (see below), whose sum is σ = 1500969689280. Its totient is φ = 1481076284688.

The previous prime is 1491020122099. The next prime is 1491020122129. The reversal of 1491020122121 is 1212210201941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1491020122121 - 2¹⁸ = 1491019859977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491020122129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 909611 + ... + 1951776.

It is an arithmetic number, because the mean of its divisors is an integer number (187621211160).

Almost surely, 2^{1491020122121} is an apocalyptic number.

It is an amenable number.

1491020122121 is a deficient number, since it is larger than the sum of its proper divisors (9949567159).

1491020122121 is a wasteful number, since it uses less digits than its factorization.

1491020122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864863.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 1491020122121 in words is "one trillion, four hundred ninety-one billion, twenty million, one hundred twenty-two thousand, one hundred twenty-one".