1221542542022 has 16 divisors (see below), whose sum is σ = 2104092417600. Its totient is φ = 526023104040.

The previous prime is 1221542542007. The next prime is 1221542542037. The reversal of 1221542542022 is 2202452451221.

It is an interprime number because it is at equal distance from previous prime (1221542542007) and next prime (1221542542037).

It is a self number, because there is not a number n which added to its sum of digits gives 1221542542022.

It is a congruent 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 in 7 ways as a sum of consecutive naturals, for example, 1461174872 + ... + 1461175707.

It is an arithmetic number, because the mean of its divisors is an integer number (131505776100).

Almost surely, 2^{1221542542022} is an apocalyptic number.

1221542542022 is a deficient number, since it is larger than the sum of its proper divisors (882549875578).

1221542542022 is a wasteful number, since it uses less digits than its factorization.

1221542542022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922350611.

The product of its (nonzero) digits is 25600, while the sum is 32.

Adding to 1221542542022 its reverse (2202452451221), we get a palindrome (3423994993243).

The spelling of 1221542542022 in words is "one trillion, two hundred twenty-one billion, five hundred forty-two million, five hundred forty-two thousand, twenty-two".