22021606216225 has 96 divisors (see below), whose sum is σ = 34745176166400. Its totient is φ = 13725560520000.

The previous prime is 22021606216219. The next prime is 22021606216241. The reversal of 22021606216225 is 52261260612022.

It is a de Polignac number, because none of the positive numbers 2^k-22021606216225 is a prime.

It is a super-2 number, since 2×22021606216225² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 749963394 + ... + 749992756.

It is an arithmetic number, because the mean of its divisors is an integer number (361928918400).

Almost surely, 2^{22021606216225} is an apocalyptic number.

22021606216225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22021606216225 is a deficient number, since it is larger than the sum of its proper divisors (12723569950175).

22021606216225 is a wasteful number, since it uses less digits than its factorization.

22021606216225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37356 (or 37337 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 22021606216225 its reverse (52261260612022), we get a palindrome (74282866828247).

The spelling of 22021606216225 in words is "twenty-two trillion, twenty-one billion, six hundred six million, two hundred sixteen thousand, two hundred twenty-five".