21235433912 has 32 divisors (see below), whose sum is σ = 49641275520. Its totient is φ = 8273545440.

The previous prime is 21235433899. The next prime is 21235433977. The reversal of 21235433912 is 21933453212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17235938 + ... + 17237169.

It is an arithmetic number, because the mean of its divisors is an integer number (1551289860).

Almost surely, 2^21235433912 is an apocalyptic number.

21235433912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21235433912 is an abundant number, since it is smaller than the sum of its proper divisors (28405841608).

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

21235433912 is a wasteful number, since it uses less digits than its factorization.

21235433912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34473131 (or 34473127 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The spelling of 21235433912 in words is "twenty-one billion, two hundred thirty-five million, four hundred thirty-three thousand, nine hundred twelve".