21239054386 has 8 divisors (see below), whose sum is σ = 34754816304. Its totient is φ = 9654115620.

The previous prime is 21239054383. The next prime is 21239054387. The reversal of 21239054386 is 68345093212.

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

It is a super-2 number, since 2×21239054386² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21239054383) 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, 482705760 + ... + 482705803.

It is an arithmetic number, because the mean of its divisors is an integer number (4344352038).

Almost surely, 2^21239054386 is an apocalyptic number.

21239054386 is a deficient number, since it is larger than the sum of its proper divisors (13515761918).

21239054386 is a wasteful number, since it uses less digits than its factorization.

21239054386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965411576.

The product of its (nonzero) digits is 311040, while the sum is 43.

It can be divided in two parts, 2123 and 9054386, that added together give a palindrome (9056509).

The spelling of 21239054386 in words is "twenty-one billion, two hundred thirty-nine million, fifty-four thousand, three hundred eighty-six".