21123633236152 has 8 divisors (see below), whose sum is σ = 39606812317800. Its totient is φ = 10561816618072.

The previous prime is 21123633236141. The next prime is 21123633236177. The reversal of 21123633236152 is 25163233632112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320227077252 + ... + 1320227077267.

It is an arithmetic number, because the mean of its divisors is an integer number (4950851539725).

Almost surely, 2^{21123633236152} is an apocalyptic number.

It is an amenable number.

21123633236152 is a deficient number, since it is larger than the sum of its proper divisors (18483179081648).

21123633236152 is a wasteful number, since it uses less digits than its factorization.

21123633236152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640454154525 (or 2640454154521 counting only the distinct ones).

The product of its digits is 233280, while the sum is 40.

Adding to 21123633236152 its reverse (25163233632112), we get a palindrome (46286866868264).

The spelling of 21123633236152 in words is "twenty-one trillion, one hundred twenty-three billion, six hundred thirty-three million, two hundred thirty-six thousand, one hundred fifty-two".