21555321362 has 16 divisors (see below), whose sum is σ = 34037763840. Its totient is φ = 10209501648.

The previous prime is 21555321353. The next prime is 21555321383. The reversal of 21555321362 is 26312355512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613988 + ... + 648144.

It is an arithmetic number, because the mean of its divisors is an integer number (2127360240).

Almost surely, 2^21555321362 is an apocalyptic number.

21555321362 is a deficient number, since it is larger than the sum of its proper divisors (12482442478).

21555321362 is a wasteful number, since it uses less digits than its factorization.

21555321362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50785.

The product of its digits is 54000, while the sum is 35.

Adding to 21555321362 its reverse (26312355512), we get a palindrome (47867676874).

The spelling of 21555321362 in words is "twenty-one billion, five hundred fifty-five million, three hundred twenty-one thousand, three hundred sixty-two".