21033405023 has 16 divisors (see below), whose sum is σ = 23598109440. Its totient is φ = 18630000000.

The previous prime is 21033405017. The next prime is 21033405031. The reversal of 21033405023 is 32050433012.

It is a cyclic number.

It is not a de Polignac number, because 21033405023 - 2¹⁰ = 21033403999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21033405023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033405013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166853 + ... + 264398.

It is an arithmetic number, because the mean of its divisors is an integer number (1474881840).

Almost surely, 2^21033405023 is an apocalyptic number.

21033405023 is a deficient number, since it is larger than the sum of its proper divisors (2564704417).

21033405023 is a wasteful number, since it uses less digits than its factorization.

21033405023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431438.

The product of its (nonzero) digits is 2160, while the sum is 23.

Adding to 21033405023 its reverse (32050433012), we get a palindrome (53083838035).

The spelling of 21033405023 in words is "twenty-one billion, thirty-three million, four hundred five thousand, twenty-three".