21242122434 has 48 divisors (see below), whose sum is σ = 49596785784. Its totient is φ = 6531840000.

The previous prime is 21242122423. The next prime is 21242122457. The reversal of 21242122434 is 43422124212.

It is a happy number.

21242122434 is a `hidden beast` number, since 2 + 12 + 4 + 212 + 2 + 434 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20780087409 + 462035025 = 144153^2 + 21495^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21242122398 and 21242122407.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346284 + ... + 402984.

Almost surely, 2^21242122434 is an apocalyptic number.

21242122434 is an abundant number, since it is smaller than the sum of its proper divisors (28354663350).

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

21242122434 is a wasteful number, since it uses less digits than its factorization.

21242122434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58323 (or 58320 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

Adding to 21242122434 its reverse (43422124212), we get a palindrome (64664246646).

The spelling of 21242122434 in words is "twenty-one billion, two hundred forty-two million, one hundred twenty-two thousand, four hundred thirty-four".