21612641072352 has 96 divisors (see below), whose sum is σ = 64581646913280. Its totient is φ = 6264533637120.

The previous prime is 21612641072333. The next prime is 21612641072353. The reversal of 21612641072352 is 25327014621612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612641072353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444899977 + ... + 444948552.

It is an arithmetic number, because the mean of its divisors is an integer number (672725488680).

Almost surely, 2^{21612641072352} is an apocalyptic number.

21612641072352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21612641072352 is an abundant number, since it is smaller than the sum of its proper divisors (42969005840928).

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

21612641072352 is a wasteful number, since it uses less digits than its factorization.

21612641072352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889848576 (or 889848568 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

Adding to 21612641072352 its reverse (25327014621612), we get a palindrome (46939655693964).

The spelling of 21612641072352 in words is "twenty-one trillion, six hundred twelve billion, six hundred forty-one million, seventy-two thousand, three hundred fifty-two".