21142033993 has 4 divisors (see below), whose sum is σ = 21167233920. Its totient is φ = 21116834068.

The previous prime is 21142033967. The next prime is 21142034029. The reversal of 21142033993 is 39933024112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21142033993 - 2²¹ = 21139936841 is a prime.

It is a super-2 number, since 2×21142033993² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112033993) 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 3 ways as a sum of consecutive naturals, for example, 12598705 + ... + 12600382.

It is an arithmetic number, because the mean of its divisors is an integer number (5291808480).

Almost surely, 2^21142033993 is an apocalyptic number.

It is an amenable number.

21142033993 is a deficient number, since it is larger than the sum of its proper divisors (25199927).

21142033993 is an equidigital number, since it uses as much as digits as its factorization.

21142033993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25199926.

The product of its (nonzero) digits is 34992, while the sum is 37.

The spelling of 21142033993 in words is "twenty-one billion, one hundred forty-two million, thirty-three thousand, nine hundred ninety-three".