21211285386 has 32 divisors (see below), whose sum is σ = 43941464640. Its totient is φ = 6817902336.

The previous prime is 21211285313. The next prime is 21211285391. The reversal of 21211285386 is 68358211212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59490 + ... + 214386.

It is an arithmetic number, because the mean of its divisors is an integer number (1373170770).

Almost surely, 2^21211285386 is an apocalyptic number.

21211285386 is an abundant number, since it is smaller than the sum of its proper divisors (22730179254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211285386 is a wasteful number, since it uses less digits than its factorization.

21211285386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155718.

The product of its digits is 46080, while the sum is 39.

Adding to 21211285386 its reverse (68358211212), we get a palindrome (89569496598).

The spelling of 21211285386 in words is "twenty-one billion, two hundred eleven million, two hundred eighty-five thousand, three hundred eighty-six".