215420245230431 has 4 divisors (see below), whose sum is σ = 215686524891600. Its totient is φ = 215153965569264.

The previous prime is 215420245230419. The next prime is 215420245230479. The reversal of 215420245230431 is 134032542024512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215420245230431 is a prime.

It is a super-2 number, since 2×215420245230431² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215420245236431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133139829371 + ... + 133139830988.

It is an arithmetic number, because the mean of its divisors is an integer number (53921631222900).

Almost surely, 2^{215420245230431} is an apocalyptic number.

215420245230431 is a deficient number, since it is larger than the sum of its proper divisors (266279661169).

215420245230431 is an equidigital number, since it uses as much as digits as its factorization.

215420245230431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266279661168.

The product of its (nonzero) digits is 230400, while the sum is 38.

Adding to 215420245230431 its reverse (134032542024512), we get a palindrome (349452787254943).

The spelling of 215420245230431 in words is "two hundred fifteen trillion, four hundred twenty billion, two hundred forty-five million, two hundred thirty thousand, four hundred thirty-one".