245215421 has 4 divisors (see below), whose sum is σ = 267507744. Its totient is φ = 222923100.

The previous prime is 245215357. The next prime is 245215507. The reversal of 245215421 is 124512542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 245215421 - 2⁶ = 245215357 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 (245215721) 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, 11146145 + ... + 11146166.

It is an arithmetic number, because the mean of its divisors is an integer number (66876936).

Almost surely, 2^245215421 is an apocalyptic number.

It is an amenable number.

245215421 is a deficient number, since it is larger than the sum of its proper divisors (22292323).

245215421 is a wasteful number, since it uses less digits than its factorization.

245215421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22292322.

The product of its digits is 3200, while the sum is 26.

The square root of 245215421 is about 15659.3557019438. The cubic root of 245215421 is about 625.9158166457.

Adding to 245215421 its reverse (124512542), we get a palindrome (369727963).

The spelling of 245215421 in words is "two hundred forty-five million, two hundred fifteen thousand, four hundred twenty-one".