21002152039 has 4 divisors (see below), whose sum is σ = 22911438600. Its totient is φ = 19092865480.

The previous prime is 21002152013. The next prime is 21002152069. The reversal of 21002152039 is 93025120012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21002152039 - 2¹¹ = 21002149991 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 (21002152069) 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 3 ways as a sum of consecutive naturals, for example, 954643264 + ... + 954643285.

It is an arithmetic number, because the mean of its divisors is an integer number (5727859650).

Almost surely, 2^21002152039 is an apocalyptic number.

21002152039 is a deficient number, since it is larger than the sum of its proper divisors (1909286561).

21002152039 is a wasteful number, since it uses less digits than its factorization.

21002152039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909286560.

The product of its (nonzero) digits is 1080, while the sum is 25.

The spelling of 21002152039 in words is "twenty-one billion, two million, one hundred fifty-two thousand, thirty-nine".