1221072151604 has 12 divisors (see below), whose sum is σ = 2229783929184. Its totient is φ = 583991028984.

The previous prime is 1221072151589. The next prime is 1221072151639. The reversal of 1221072151604 is 4061512701221.

It is a super-3 number, since 3×1221072151604³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6636261602 + ... + 6636261785.

It is an arithmetic number, because the mean of its divisors is an integer number (185815327432).

Almost surely, 2^{1221072151604} is an apocalyptic number.

It is an amenable number.

1221072151604 is a deficient number, since it is larger than the sum of its proper divisors (1008711777580).

1221072151604 is a wasteful number, since it uses less digits than its factorization.

1221072151604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13272523414 (or 13272523412 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

Adding to 1221072151604 its reverse (4061512701221), we get a palindrome (5282584852825).

The spelling of 1221072151604 in words is "one trillion, two hundred twenty-one billion, seventy-two million, one hundred fifty-one thousand, six hundred four".