21451433837 has 8 divisors (see below), whose sum is σ = 21484202880. Its totient is φ = 21418689600.

The previous prime is 21451433831. The next prime is 21451433849. The reversal of 21451433837 is 73833415412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21451433837 - 2⁴ = 21451433821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21451433794 and 21451433803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451433831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2367638 + ... + 2376680.

It is an arithmetic number, because the mean of its divisors is an integer number (2685525360).

Almost surely, 2^21451433837 is an apocalyptic number.

It is an amenable number.

21451433837 is a deficient number, since it is larger than the sum of its proper divisors (32769043).

21451433837 is a wasteful number, since it uses less digits than its factorization.

21451433837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12403.

The product of its digits is 241920, while the sum is 41.

The spelling of 21451433837 in words is "twenty-one billion, four hundred fifty-one million, four hundred thirty-three thousand, eight hundred thirty-seven".