21142120333 has 4 divisors (see below), whose sum is σ = 21173350140. Its totient is φ = 21110890528.

The previous prime is 21142120327. The next prime is 21142120339. The reversal of 21142120333 is 33302124112.

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

It is an interprime number because it is at equal distance from previous prime (21142120327) and next prime (21142120339).

It can be written as a sum of positive squares in 2 ways, for example, as 15414960649 + 5727159684 = 124157^2 + 75678^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142120333 - 2⁹ = 21142119821 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 (21142120339) 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, 15613888 + ... + 15615241.

It is an arithmetic number, because the mean of its divisors is an integer number (5293337535).

Almost surely, 2^21142120333 is an apocalyptic number.

It is an amenable number.

21142120333 is a deficient number, since it is larger than the sum of its proper divisors (31229807).

21142120333 is an equidigital number, since it uses as much as digits as its factorization.

21142120333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31229806.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21142120333 its reverse (33302124112), we get a palindrome (54444244445).

The spelling of 21142120333 in words is "twenty-one billion, one hundred forty-two million, one hundred twenty thousand, three hundred thirty-three".