20421214242 has 64 divisors (see below), whose sum is σ = 48226679424. Its totient is φ = 5683184640.

The previous prime is 20421214241. The next prime is 20421214243. The reversal of 20421214242 is 24241212402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20421214241) and next prime (20421214243).

It is a super-2 number, since 2×20421214242² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20421214241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108618 + ... + 229434.

It is an arithmetic number, because the mean of its divisors is an integer number (753541866).

Almost surely, 2^20421214242 is an apocalyptic number.

20421214242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20421214242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24113339712).

20421214242 is an abundant number, since it is smaller than the sum of its proper divisors (27805465182).

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

20421214242 is a wasteful number, since it uses less digits than its factorization.

20421214242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121043.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 20421214242 its reverse (24241212402), we get a palindrome (44662426644).

The spelling of 20421214242 in words is "twenty billion, four hundred twenty-one million, two hundred fourteen thousand, two hundred forty-two".