21010126039 has 16 divisors (see below), whose sum is σ = 25475040000. Its totient is φ = 16915330944.

The previous prime is 21010126021. The next prime is 21010126097. The reversal of 21010126039 is 93062101012.

It is a cyclic number.

It is not a de Polignac number, because 21010126039 - 2⁹ = 21010125527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010126009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117529 + ... + 236290.

It is an arithmetic number, because the mean of its divisors is an integer number (1592190000).

Almost surely, 2^21010126039 is an apocalyptic number.

21010126039 is a deficient number, since it is larger than the sum of its proper divisors (4464913961).

21010126039 is a wasteful number, since it uses less digits than its factorization.

21010126039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354342.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21010126039 in words is "twenty-one billion, ten million, one hundred twenty-six thousand, thirty-nine".