21077030239 has 4 divisors (see below), whose sum is σ = 22186347640. Its totient is φ = 19967712840.

The previous prime is 21077030203. The next prime is 21077030297. The reversal of 21077030239 is 93203077012.

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 21077030239 - 2¹¹ = 21077028191 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 (21077039239) 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, 554658672 + ... + 554658709.

It is an arithmetic number, because the mean of its divisors is an integer number (5546586910).

Almost surely, 2^21077030239 is an apocalyptic number.

21077030239 is a deficient number, since it is larger than the sum of its proper divisors (1109317401).

21077030239 is a wasteful number, since it uses less digits than its factorization.

21077030239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109317400.

The product of its (nonzero) digits is 15876, while the sum is 34.

The spelling of 21077030239 in words is "twenty-one billion, seventy-seven million, thirty thousand, two hundred thirty-nine".