1213180257721 has 8 divisors (see below), whose sum is σ = 1273693654080. Its totient is φ = 1153314063792.

The previous prime is 1213180257719. The next prime is 1213180257727. The reversal of 1213180257721 is 1277520813121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213180257721 - 2¹ = 1213180257719 is a prime.

It is a super-2 number, since 2×1213180257721² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213180257727) by changing a digit.

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, 161796766 + ... + 161804263.

It is an arithmetic number, because the mean of its divisors is an integer number (159211706760).

Almost surely, 2^{1213180257721} is an apocalyptic number.

It is an amenable number.

1213180257721 is a deficient number, since it is larger than the sum of its proper divisors (60513396359).

1213180257721 is a wasteful number, since it uses less digits than its factorization.

1213180257721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323601215.

The product of its (nonzero) digits is 47040, while the sum is 40.

The spelling of 1213180257721 in words is "one trillion, two hundred thirteen billion, one hundred eighty million, two hundred fifty-seven thousand, seven hundred twenty-one".