20421022242 has 16 divisors (see below), whose sum is σ = 41791860000. Its totient is φ = 6648704832.

The previous prime is 20421022241. The next prime is 20421022247. The reversal of 20421022242 is 24222012402.

It is not an unprimeable number, because it can be changed into a prime (20421022241) 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, 39575367 + ... + 39575882.

It is an arithmetic number, because the mean of its divisors is an integer number (2611991250).

Almost surely, 2^20421022242 is an apocalyptic number.

20421022242 is an abundant number, since it is smaller than the sum of its proper divisors (21370837758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20421022242 is a wasteful number, since it uses less digits than its factorization.

20421022242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79151297.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 20421022242 its reverse (24222012402), we get a palindrome (44643034644).

The spelling of 20421022242 in words is "twenty billion, four hundred twenty-one million, twenty-two thousand, two hundred forty-two".