21333434025 has 12 divisors (see below), whose sum is σ = 35271277712. Its totient is φ = 11377831440.

The previous prime is 21333433981. The next prime is 21333434027. The reversal of 21333434025 is 52043433312.

It is a de Polignac number, because none of the positive numbers 2^k-21333434025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21333433983 and 21333434001.

It is not an unprimeable number, because it can be changed into a prime (21333434027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142222819 + ... + 142222968.

Almost surely, 2^21333434025 is an apocalyptic number.

21333434025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21333434025 is a deficient number, since it is larger than the sum of its proper divisors (13937843687).

21333434025 is a wasteful number, since it uses less digits than its factorization.

21333434025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284445800 (or 284445795 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 30.

Adding to 21333434025 its reverse (52043433312), we get a palindrome (73376867337).

The spelling of 21333434025 in words is "twenty-one billion, three hundred thirty-three million, four hundred thirty-four thousand, twenty-five".