21439221407 has 8 divisors (see below), whose sum is σ = 22702389696. Its totient is φ = 20176279552.

The previous prime is 21439221359. The next prime is 21439221431. The reversal of 21439221407 is 70412293412.

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 21439221407 - 2¹⁴ = 21439205023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21439221437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162623 + ... + 263295.

It is an arithmetic number, because the mean of its divisors is an integer number (2837798712).

Almost surely, 2^21439221407 is an apocalyptic number.

21439221407 is a deficient number, since it is larger than the sum of its proper divisors (1263168289).

21439221407 is a wasteful number, since it uses less digits than its factorization.

21439221407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113217.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 21439221407 in words is "twenty-one billion, four hundred thirty-nine million, two hundred twenty-one thousand, four hundred seven".