245551502021 has 16 divisors (see below), whose sum is σ = 293266305024. Its totient is φ = 201203990064.

The previous prime is 245551501991. The next prime is 245551502033. The reversal of 245551502021 is 120205155542.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-245551502021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245551502041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8664425 + ... + 8692718.

It is an arithmetic number, because the mean of its divisors is an integer number (18329144064).

Almost surely, 2^245551502021 is an apocalyptic number.

It is an amenable number.

245551502021 is a deficient number, since it is larger than the sum of its proper divisors (47714803003).

245551502021 is a wasteful number, since it uses less digits than its factorization.

245551502021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17357240.

The product of its (nonzero) digits is 20000, while the sum is 32.

Adding to 245551502021 its reverse (120205155542), we get a palindrome (365756657563).

The spelling of 245551502021 in words is "two hundred forty-five billion, five hundred fifty-one million, five hundred two thousand, twenty-one".