20421242000 has 40 divisors (see below), whose sum is σ = 49378567992. Its totient is φ = 8168496000.

The previous prime is 20421241949. The next prime is 20421242041. The reversal of 20421242000 is 24212402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 216325264 + 20204916736 = 14708^2 + 142144^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 20421242000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5103311 + ... + 5107310.

Almost surely, 2^20421242000 is an apocalyptic number.

20421242000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421242000 is an abundant number, since it is smaller than the sum of its proper divisors (28957325992).

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

20421242000 is a wasteful number, since it uses less digits than its factorization.

20421242000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210644 (or 10210628 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 20421242000 its reverse (24212402), we get a palindrome (20445454402).

The spelling of 20421242000 in words is "twenty billion, four hundred twenty-one million, two hundred forty-two thousand".