20442135021 has 48 divisors (see below), whose sum is σ = 35324605440. Its totient is φ = 10393309920.

The previous prime is 20442134969. The next prime is 20442135053. The reversal of 20442135021 is 12053124402.

It is not a de Polignac number, because 20442135021 - 2⁹ = 20442134509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20442134982 and 20442135000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20442135121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58491 + ... + 210488.

It is an arithmetic number, because the mean of its divisors is an integer number (735929280).

Almost surely, 2^20442135021 is an apocalyptic number.

20442135021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20442135021 is a deficient number, since it is larger than the sum of its proper divisors (14882470419).

20442135021 is a wasteful number, since it uses less digits than its factorization.

20442135021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269054 (or 269047 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 20442135021 its reverse (12053124402), we get a palindrome (32495259423).

The spelling of 20442135021 in words is "twenty billion, four hundred forty-two million, one hundred thirty-five thousand, twenty-one".