215013420251 has 4 divisors (see below), whose sum is σ = 245729623152. Its totient is φ = 184297217352.

The previous prime is 215013420227. The next prime is 215013420253. The reversal of 215013420251 is 152024310512.

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 215013420251 - 2¹⁴ = 215013403867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215013420251.

It is not an unprimeable number, because it can be changed into a prime (215013420253) 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, 15358101440 + ... + 15358101453.

It is an arithmetic number, because the mean of its divisors is an integer number (61432405788).

Almost surely, 2^215013420251 is an apocalyptic number.

215013420251 is a deficient number, since it is larger than the sum of its proper divisors (30716202901).

215013420251 is an equidigital number, since it uses as much as digits as its factorization.

215013420251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30716202900.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 215013420251 its reverse (152024310512), we get a palindrome (367037730763).

The spelling of 215013420251 in words is "two hundred fifteen billion, thirteen million, four hundred twenty thousand, two hundred fifty-one".