21655222602270 has 32 divisors (see below), whose sum is σ = 54232209649152. Its totient is φ = 5523650982432.

The previous prime is 21655222602263. The next prime is 21655222602283. The reversal of 21655222602270 is 7220622255612.

It is a congruent number.

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, 15692189602 + ... + 15692190981.

It is an arithmetic number, because the mean of its divisors is an integer number (1694756551536).

Almost surely, 2^{21655222602270} is an apocalyptic number.

21655222602270 is an abundant number, since it is smaller than the sum of its proper divisors (32576987046882).

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

21655222602270 is a wasteful number, since it uses less digits than its factorization.

21655222602270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31384380616.

The product of its (nonzero) digits is 403200, while the sum is 42.

Adding to 21655222602270 its reverse (7220622255612), we get a palindrome (28875844857882).

The spelling of 21655222602270 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred twenty-two million, six hundred two thousand, two hundred seventy".