245550020021 has 8 divisors (see below), whose sum is σ = 259105055040. Its totient is φ = 232234897312.

The previous prime is 245550020011. The next prime is 245550020033. The reversal of 245550020021 is 120020055542.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245550020021 is a prime.

It is a super-5 number, since 5×245550020021⁵ (a number of 58 digits) contains 55555 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245550020011) 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, 59975975 + ... + 59980068.

It is an arithmetic number, because the mean of its divisors is an integer number (32388131880).

Almost surely, 2^245550020021 is an apocalyptic number.

It is an amenable number.

245550020021 is a deficient number, since it is larger than the sum of its proper divisors (13555035019).

245550020021 is a wasteful number, since it uses less digits than its factorization.

245550020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119956155.

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 245550020021 its reverse (120020055542), we get a palindrome (365570075563).

The spelling of 245550020021 in words is "two hundred forty-five billion, five hundred fifty million, twenty thousand, twenty-one".