21433420091 has 8 divisors (see below), whose sum is σ = 21711306960. Its totient is φ = 21156001312.

The previous prime is 21433420033. The next prime is 21433420097. The reversal of 21433420091 is 19002433412.

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 21433420091 - 2³⁴ = 4253550907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21433420097) by changing a digit.

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, 24380 + ... + 208473.

It is an arithmetic number, because the mean of its divisors is an integer number (2713913370).

Almost surely, 2^21433420091 is an apocalyptic number.

21433420091 is a deficient number, since it is larger than the sum of its proper divisors (277886869).

21433420091 is a wasteful number, since it uses less digits than its factorization.

21433420091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234045.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21433420091 in words is "twenty-one billion, four hundred thirty-three million, four hundred twenty thousand, ninety-one".