245203421 has 4 divisors (see below), whose sum is σ = 245357052. Its totient is φ = 245049792.

The previous prime is 245203349. The next prime is 245203433. The reversal of 245203421 is 124302542.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 131354521 + 113848900 = 11461^2 + 10670^2 .

It is a cyclic number.

It is not a de Polignac number, because 245203421 - 2¹⁴ = 245187037 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 (245203481) 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, 74396 + ... + 77621.

It is an arithmetic number, because the mean of its divisors is an integer number (61339263).

Almost surely, 2^245203421 is an apocalyptic number.

It is an amenable number.

245203421 is a deficient number, since it is larger than the sum of its proper divisors (153631).

245203421 is a wasteful number, since it uses less digits than its factorization.

245203421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153630.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 245203421 is about 15658.9725397294. The cubic root of 245203421 is about 625.9056064228.

Adding to 245203421 its reverse (124302542), we get a palindrome (369505963).

The spelling of 245203421 in words is "two hundred forty-five million, two hundred three thousand, four hundred twenty-one".