215401122331 has 4 divisors (see below), whose sum is σ = 222349545664. Its totient is φ = 208452699000.

The previous prime is 215401122323. The next prime is 215401122337. The reversal of 215401122331 is 133221104512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215401122331 - 2³ = 215401122323 is a prime.

It is a super-2 number, since 2×215401122331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215401122296 and 215401122305.

It is not an unprimeable number, because it can be changed into a prime (215401122337) by changing a digit.

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, 3474211620 + ... + 3474211681.

It is an arithmetic number, because the mean of its divisors is an integer number (55587386416).

Almost surely, 2^215401122331 is an apocalyptic number.

215401122331 is a deficient number, since it is larger than the sum of its proper divisors (6948423333).

215401122331 is an equidigital number, since it uses as much as digits as its factorization.

215401122331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6948423332.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 215401122331 its reverse (133221104512), we get a palindrome (348622226843).

The spelling of 215401122331 in words is "two hundred fifteen billion, four hundred one million, one hundred twenty-two thousand, three hundred thirty-one".