21033813445 has 16 divisors (see below), whose sum is σ = 25552742400. Its totient is φ = 16620177024.

The previous prime is 21033813439. The next prime is 21033813469. The reversal of 21033813445 is 54431833012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033813445 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21033813445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59164 + ... + 213466.

It is an arithmetic number, because the mean of its divisors is an integer number (1597046400).

Almost surely, 2^21033813445 is an apocalyptic number.

It is an amenable number.

21033813445 is a deficient number, since it is larger than the sum of its proper divisors (4518928955).

21033813445 is a wasteful number, since it uses less digits than its factorization.

21033813445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154644.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 21033813445 in words is "twenty-one billion, thirty-three million, eight hundred thirteen thousand, four hundred forty-five".