21612563156162 has 32 divisors (see below), whose sum is σ = 35710333626240. Its totient is φ = 9728252709120.

The previous prime is 21612563156161. The next prime is 21612563156203. The reversal of 21612563156162 is 26165136521612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21612563156161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101893514 + ... + 102105402.

It is an arithmetic number, because the mean of its divisors is an integer number (1115947925820).

Almost surely, 2^{21612563156162} is an apocalyptic number.

21612563156162 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21612563156162 is a deficient number, since it is larger than the sum of its proper divisors (14097770470078).

21612563156162 is a wasteful number, since it uses less digits than its factorization.

21612563156162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257018.

The product of its digits is 777600, while the sum is 47.

Adding to 21612563156162 its reverse (26165136521612), we get a palindrome (47777699677774).

The spelling of 21612563156162 in words is "twenty-one trillion, six hundred twelve billion, five hundred sixty-three million, one hundred fifty-six thousand, one hundred sixty-two".