245122021 has 8 divisors (see below), whose sum is σ = 258268320. Its totient is φ = 232000272.

The previous prime is 245122019. The next prime is 245122039. The reversal of 245122021 is 120221542.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 245122021 - 2¹ = 245122019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

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 245122021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245122081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16551 + ... + 27643.

It is an arithmetic number, because the mean of its divisors is an integer number (32283540).

Almost surely, 2^245122021 is an apocalyptic number.

It is an amenable number.

245122021 is a deficient number, since it is larger than the sum of its proper divisors (13146299).

245122021 is a wasteful number, since it uses less digits than its factorization.

245122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12275.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 245122021 is about 15656.3731751642. The cubic root of 245122021 is about 625.8363382821.

Adding to 245122021 its reverse (120221542), we get a palindrome (365343563).

The spelling of 245122021 in words is "two hundred forty-five million, one hundred twenty-two thousand, twenty-one".