311555214320021 has 16 divisors (see below), whose sum is σ = 357823782238080. Its totient is φ = 265730072947200.

The previous prime is 311555214319991. The next prime is 311555214320023. The reversal of 311555214320021 is 120023412555113.

It is a cyclic number.

It is not a de Polignac number, because 311555214320021 - 2⁴² = 307157167808917 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 (311555214320023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134539271 + ... + 136835396.

It is an arithmetic number, because the mean of its divisors is an integer number (22363986389880).

Almost surely, 2^{311555214320021} is an apocalyptic number.

It is an amenable number.

311555214320021 is a deficient number, since it is larger than the sum of its proper divisors (46268567918059).

311555214320021 is a wasteful number, since it uses less digits than its factorization.

311555214320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271375484.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 311555214320021 its reverse (120023412555113), we get a palindrome (431578626875134).

The spelling of 311555214320021 in words is "three hundred eleven trillion, five hundred fifty-five billion, two hundred fourteen million, three hundred twenty thousand, twenty-one".