1213856221151 has 8 divisors (see below), whose sum is σ = 1387664876544. Its totient is φ = 1040147721720.

The previous prime is 1213856221141. The next prime is 1213856221181. The reversal of 1213856221151 is 1511226583121.

It is a happy number.

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 1213856221151 - 2⁶ = 1213856221087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213856221141) 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, 25013015 + ... + 25061496.

It is an arithmetic number, because the mean of its divisors is an integer number (173458109568).

Almost surely, 2^{1213856221151} is an apocalyptic number.

1213856221151 is a deficient number, since it is larger than the sum of its proper divisors (173808655393).

1213856221151 is an equidigital number, since it uses as much as digits as its factorization.

1213856221151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50077981.

The product of its digits is 28800, while the sum is 38.

The spelling of 1213856221151 in words is "one trillion, two hundred thirteen billion, eight hundred fifty-six million, two hundred twenty-one thousand, one hundred fifty-one".