21388174079 has 8 divisors (see below), whose sum is σ = 22764872448. Its totient is φ = 20024650240.

The previous prime is 21388174061. The next prime is 21388174081. The reversal of 21388174079 is 97047188312.

It is a happy number.

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 21388174079 - 2³² = 17093206783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21388174579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3290282 + ... + 3296775.

It is an arithmetic number, because the mean of its divisors is an integer number (2845609056).

Almost surely, 2^21388174079 is an apocalyptic number.

21388174079 is a deficient number, since it is larger than the sum of its proper divisors (1376698369).

21388174079 is a wasteful number, since it uses less digits than its factorization.

21388174079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6587265.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 21388174079 in words is "twenty-one billion, three hundred eighty-eight million, one hundred seventy-four thousand, seventy-nine".