21333403434 has 32 divisors (see below), whose sum is σ = 48801603456. Its totient is φ = 6090315840.

The previous prime is 21333403387. The next prime is 21333403439. The reversal of 21333403434 is 43430433312.

It is a super-2 number, since 2×21333403434² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21333403439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153357 + ... + 257264.

It is an arithmetic number, because the mean of its divisors is an integer number (1525050108).

Almost surely, 2^21333403434 is an apocalyptic number.

21333403434 is an abundant number, since it is smaller than the sum of its proper divisors (27468200022).

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

21333403434 is a wasteful number, since it uses less digits than its factorization.

21333403434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411870.

The product of its (nonzero) digits is 31104, while the sum is 30.

Adding to 21333403434 its reverse (43430433312), we get a palindrome (64763836746).

The spelling of 21333403434 in words is "twenty-one billion, three hundred thirty-three million, four hundred three thousand, four hundred thirty-four".