20245442021 has 16 divisors (see below), whose sum is σ = 23455795968. Its totient is φ = 17115936000.

The previous prime is 20245442017. The next prime is 20245442027. The reversal of 20245442021 is 12024454202.

It is a cyclic number.

It is not a de Polignac number, because 20245442021 - 2² = 20245442017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20245442027) 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, 131501 + ... + 240381.

It is an arithmetic number, because the mean of its divisors is an integer number (1465987248).

Almost surely, 2^20245442021 is an apocalyptic number.

It is an amenable number.

20245442021 is a deficient number, since it is larger than the sum of its proper divisors (3210353947).

20245442021 is a wasteful number, since it uses less digits than its factorization.

20245442021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109252.

The product of its (nonzero) digits is 5120, while the sum is 26.

Adding to 20245442021 its reverse (12024454202), we get a palindrome (32269896223).

The spelling of 20245442021 in words is "twenty billion, two hundred forty-five million, four hundred forty-two thousand, twenty-one".