1221055851442 has 8 divisors (see below), whose sum is σ = 2093238602496. Its totient is φ = 523309650612.

The previous prime is 1221055851419. The next prime is 1221055851511. The reversal of 1221055851442 is 2441585501221.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221055851395 and 1221055851404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43609137538 + ... + 43609137565.

It is an arithmetic number, because the mean of its divisors is an integer number (261654825312).

Almost surely, 2^{1221055851442} is an apocalyptic number.

1221055851442 is a deficient number, since it is larger than the sum of its proper divisors (872182751054).

1221055851442 is an equidigital number, since it uses as much as digits as its factorization.

1221055851442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87218275112.

The product of its (nonzero) digits is 128000, while the sum is 40.

The spelling of 1221055851442 in words is "one trillion, two hundred twenty-one billion, fifty-five million, eight hundred fifty-one thousand, four hundred forty-two".