215421343253 has 2 divisors, whose sum is σ = 215421343254. Its totient is φ = 215421343252.

The previous prime is 215421343229. The next prime is 215421343289. The reversal of 215421343253 is 352343124512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215312704324 + 108638929 = 464018^2 + 10423^2 .

It is a cyclic number.

It is not a de Polignac number, because 215421343253 - 2³⁶ = 146701866517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215421343453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107710671626 + 107710671627.

It is an arithmetic number, because the mean of its divisors is an integer number (107710671627).

Almost surely, 2^215421343253 is an apocalyptic number.

It is an amenable number.

215421343253 is a deficient number, since it is larger than the sum of its proper divisors (1).

215421343253 is an equidigital number, since it uses as much as digits as its factorization.

215421343253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 35.

Adding to 215421343253 its reverse (352343124512), we get a palindrome (567764467765).

The spelling of 215421343253 in words is "two hundred fifteen billion, four hundred twenty-one million, three hundred forty-three thousand, two hundred fifty-three".