21386925371 has 8 divisors (see below), whose sum is σ = 24786457344. Its totient is φ = 18073457640.

The previous prime is 21386925341. The next prime is 21386925379. The reversal of 21386925371 is 17352968312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21386925371 - 2²² = 21382731067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21386925379) 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 7 ways as a sum of consecutive naturals, for example, 21515525 + ... + 21516518.

It is an arithmetic number, because the mean of its divisors is an integer number (3098307168).

Almost surely, 2^21386925371 is an apocalyptic number.

21386925371 is a deficient number, since it is larger than the sum of its proper divisors (3399531973).

21386925371 is an equidigital number, since it uses as much as digits as its factorization.

21386925371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43032121.

The product of its digits is 544320, while the sum is 47.

The spelling of 21386925371 in words is "twenty-one billion, three hundred eighty-six million, nine hundred twenty-five thousand, three hundred seventy-one".