1221882040154 has 4 divisors (see below), whose sum is σ = 1832823060234. Its totient is φ = 610941020076.

The previous prime is 1221882040109. The next prime is 1221882040361. The reversal of 1221882040154 is 4510402881221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1068670075225 + 153211964929 = 1033765^2 + 391423^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305470510037 + ... + 305470510040.

Almost surely, 2^{1221882040154} is an apocalyptic number.

1221882040154 is a deficient number, since it is larger than the sum of its proper divisors (610941020080).

1221882040154 is an equidigital number, since it uses as much as digits as its factorization.

1221882040154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610941020079.

The product of its (nonzero) digits is 40960, while the sum is 38.

The spelling of 1221882040154 in words is "one trillion, two hundred twenty-one billion, eight hundred eighty-two million, forty thousand, one hundred fifty-four".