1221540252235 has 16 divisors (see below), whose sum is σ = 1573934887872. Its totient is φ = 906793753600.

The previous prime is 1221540252217. The next prime is 1221540252239. The reversal of 1221540252235 is 5322520451221.

It is not a de Polignac number, because 1221540252235 - 2³³ = 1212950317643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221540252235.

It is not an unprimeable number, because it can be changed into a prime (1221540252239) 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 15 ways as a sum of consecutive naturals, for example, 101198626 + ... + 101210695.

It is an arithmetic number, because the mean of its divisors is an integer number (98370930492).

Almost surely, 2^{1221540252235} is an apocalyptic number.

1221540252235 is a deficient number, since it is larger than the sum of its proper divisors (352394635637).

1221540252235 is a wasteful number, since it uses less digits than its factorization.

1221540252235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202409414.

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 1221540252235 in words is "one trillion, two hundred twenty-one billion, five hundred forty million, two hundred fifty-two thousand, two hundred thirty-five".