21033042340023 has 40 divisors (see below), whose sum is σ = 35912117602592. Its totient is φ = 12017591080704.

The previous prime is 21033042339973. The next prime is 21033042340031. The reversal of 21033042340023 is 32004324033012.

21033042340023 is a `hidden beast` number, since 2 + 10 + 3 + 304 + 2 + 340 + 0 + 2 + 3 = 666.

It is not a de Polignac number, because 21033042340023 - 2¹⁷ = 21033042208951 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033042340033) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3307611 + ... + 7280547.

Almost surely, 2^{21033042340023} is an apocalyptic number.

21033042340023 is a deficient number, since it is larger than the sum of its proper divisors (14879075262569).

21033042340023 is an equidigital number, since it uses as much as digits as its factorization.

21033042340023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982293 (or 3982284 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21033042340023 its reverse (32004324033012), we get a palindrome (53037366373035).

The spelling of 21033042340023 in words is "twenty-one trillion, thirty-three billion, forty-two million, three hundred forty thousand, twenty-three".