1221552552122 has 16 divisors (see below), whose sum is σ = 2094160504320. Its totient is φ = 523504918608.

The previous prime is 1221552552089. The next prime is 1221552552127. The reversal of 1221552552122 is 2212552551221.

It is not an unprimeable number, because it can be changed into a prime (1221552552127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031297 + ... + 1872612.

It is an arithmetic number, because the mean of its divisors is an integer number (130885031520).

Almost surely, 2^{1221552552122} is an apocalyptic number.

1221552552122 is a deficient number, since it is larger than the sum of its proper divisors (872607952198).

1221552552122 is a wasteful number, since it uses less digits than its factorization.

1221552552122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933965.

The product of its digits is 40000, while the sum is 35.

Subtracting 1221552552122 from its reverse (2212552551221), we obtain a palindrome (990999999099).

The spelling of 1221552552122 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-two million, five hundred fifty-two thousand, one hundred twenty-two".