21438870835 has 8 divisors (see below), whose sum is σ = 25808840640. Its totient is φ = 17096299584.

The previous prime is 21438870763. The next prime is 21438870847. The reversal of 21438870835 is 53807883412.

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 21438870835 - 2¹⁹ = 21438346547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6847915 + ... + 6851044.

It is an arithmetic number, because the mean of its divisors is an integer number (3226105080).

Almost surely, 2^21438870835 is an apocalyptic number.

21438870835 is a deficient number, since it is larger than the sum of its proper divisors (4369969805).

21438870835 is a wasteful number, since it uses less digits than its factorization.

21438870835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13699277.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 21438870835 in words is "twenty-one billion, four hundred thirty-eight million, eight hundred seventy thousand, eight hundred thirty-five".