21655020162 has 16 divisors (see below), whose sum is σ = 43714808352. Its totient is φ = 7150878720.

The previous prime is 21655020151. The next prime is 21655020169. The reversal of 21655020162 is 26102055612.

It is not an unprimeable number, because it can be changed into a prime (21655020169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16864639 + ... + 16865922.

It is an arithmetic number, because the mean of its divisors is an integer number (2732175522).

Almost surely, 2^21655020162 is an apocalyptic number.

21655020162 is an abundant number, since it is smaller than the sum of its proper divisors (22059788190).

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

21655020162 is a wasteful number, since it uses less digits than its factorization.

21655020162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33730673.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 21655020162 its reverse (26102055612), we get a palindrome (47757075774).

The spelling of 21655020162 in words is "twenty-one billion, six hundred fifty-five million, twenty thousand, one hundred sixty-two".