21040240323045 has 16 divisors (see below), whose sum is σ = 34485467067072. Its totient is φ = 10947767322240.

The previous prime is 21040240323031. The next prime is 21040240323073. The reversal of 21040240323045 is 54032304204012.

It is not a de Polignac number, because 21040240323045 - 2⁸ = 21040240322789 is a prime.

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, 17105885827 + ... + 17105887056.

It is an arithmetic number, because the mean of its divisors is an integer number (2155341691692).

Almost surely, 2^{21040240323045} is an apocalyptic number.

It is an amenable number.

21040240323045 is a deficient number, since it is larger than the sum of its proper divisors (13445226744027).

21040240323045 is a wasteful number, since it uses less digits than its factorization.

21040240323045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34211772932.

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 21040240323045 its reverse (54032304204012), we get a palindrome (75072544527057).

The spelling of 21040240323045 in words is "twenty-one trillion, forty billion, two hundred forty million, three hundred twenty-three thousand, forty-five".