21012451039 has 8 divisors (see below), whose sum is σ = 21061342512. Its totient is φ = 20963611200.

The previous prime is 21012451007. The next prime is 21012451049. The reversal of 21012451039 is 93015421012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012451039 - 2⁵ = 21012451007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012450998 and 21012451016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012451049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 870939 + ... + 894739.

It is an arithmetic number, because the mean of its divisors is an integer number (2632667814).

Almost surely, 2^21012451039 is an apocalyptic number.

21012451039 is a deficient number, since it is larger than the sum of its proper divisors (48891473).

21012451039 is a wasteful number, since it uses less digits than its factorization.

21012451039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25817.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 21012451039 in words is "twenty-one billion, twelve million, four hundred fifty-one thousand, thirty-nine".