21942238133 has 8 divisors (see below), whose sum is σ = 22157550360. Its totient is φ = 21727180800.

The previous prime is 21942238121. The next prime is 21942238139. The reversal of 21942238133 is 33183224912.

It can be written as a sum of positive squares in 4 ways, for example, as 14656249969 + 7285988164 = 121063^2 + 85358^2 .

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 21942238133 - 2⁴ = 21942238117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21942238139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111641 + ... + 237377.

It is an arithmetic number, because the mean of its divisors is an integer number (2769693795).

Almost surely, 2^21942238133 is an apocalyptic number.

It is an amenable number.

21942238133 is a deficient number, since it is larger than the sum of its proper divisors (215312227).

21942238133 is a wasteful number, since it uses less digits than its factorization.

21942238133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127447.

The product of its digits is 62208, while the sum is 38.

The spelling of 21942238133 in words is "twenty-one billion, nine hundred forty-two million, two hundred thirty-eight thousand, one hundred thirty-three".