1221022153140 has 48 divisors (see below), whose sum is σ = 3449117464128. Its totient is φ = 322724437504.

The previous prime is 1221022153103. The next prime is 1221022153151. The reversal of 1221022153140 is 413512201221.

It is a happy number.

It is a super-2 number, since 2×1221022153140² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221022153140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90039102 + ... + 90052661.

It is an arithmetic number, because the mean of its divisors is an integer number (71856613836).

Almost surely, 2^{1221022153140} is an apocalyptic number.

1221022153140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221022153140 is an abundant number, since it is smaller than the sum of its proper divisors (2228095310988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221022153140 is a wasteful number, since it uses less digits than its factorization.

1221022153140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180091888 (or 180091886 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 1221022153140 its reverse (413512201221), we get a palindrome (1634534354361).

The spelling of 1221022153140 in words is "one trillion, two hundred twenty-one billion, twenty-two million, one hundred fifty-three thousand, one hundred forty".