21939593019 has 4 divisors (see below), whose sum is σ = 29252790696. Its totient is φ = 14626395344.

The previous prime is 21939592967. The next prime is 21939593021. The reversal of 21939593019 is 91039593912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21939593019 - 2⁷ = 21939592891 is a prime.

It is a super-2 number, since 2×21939593019² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21939593069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3656598834 + ... + 3656598839.

It is an arithmetic number, because the mean of its divisors is an integer number (7313197674).

Almost surely, 2^21939593019 is an apocalyptic number.

21939593019 is a deficient number, since it is larger than the sum of its proper divisors (7313197677).

21939593019 is an equidigital number, since it uses as much as digits as its factorization.

21939593019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7313197676.

The product of its (nonzero) digits is 590490, while the sum is 51.

The spelling of 21939593019 in words is "twenty-one billion, nine hundred thirty-nine million, five hundred ninety-three thousand, nineteen".