21240541033 has 4 divisors (see below), whose sum is σ = 21925719808. Its totient is φ = 20555362260.

The previous prime is 21240541031. The next prime is 21240541037. The reversal of 21240541033 is 33014504212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21240541033 - 2¹ = 21240541031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21240540989 and 21240541007.

It is not an unprimeable number, because it can be changed into a prime (21240541031) 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, 342589341 + ... + 342589402.

It is an arithmetic number, because the mean of its divisors is an integer number (5481429952).

Almost surely, 2^21240541033 is an apocalyptic number.

It is an amenable number.

21240541033 is a deficient number, since it is larger than the sum of its proper divisors (685178775).

21240541033 is an equidigital number, since it uses as much as digits as its factorization.

21240541033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685178774.

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 21240541033 in words is "twenty-one billion, two hundred forty million, five hundred forty-one thousand, thirty-three".