21010100039 has 2 divisors, whose sum is σ = 21010100040. Its totient is φ = 21010100038.

The previous prime is 21010100021. The next prime is 21010100047. The reversal of 21010100039 is 93000101012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010100039 - 2³² = 16715132743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010100939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505050019 + 10505050020.

It is an arithmetic number, because the mean of its divisors is an integer number (10505050020).

Almost surely, 2^21010100039 is an apocalyptic number.

21010100039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010100039 is an equidigital number, since it uses as much as digits as its factorization.

21010100039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The spelling of 21010100039 in words is "twenty-one billion, ten million, one hundred thousand, thirty-nine".