21116203623652 has 24 divisors (see below), whose sum is σ = 38595303262656. Its totient is φ = 10089814102368.

The previous prime is 21116203623587. The next prime is 21116203623667. The reversal of 21116203623652 is 25632630261112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104896678 + ... + 105097789.

It is an arithmetic number, because the mean of its divisors is an integer number (1608137635944).

Almost surely, 2^{21116203623652} is an apocalyptic number.

It is an amenable number.

21116203623652 is a deficient number, since it is larger than the sum of its proper divisors (17479099639004).

21116203623652 is a wasteful number, since it uses less digits than its factorization.

21116203623652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209995587 (or 209995585 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

Adding to 21116203623652 its reverse (25632630261112), we get a palindrome (46748833884764).

The spelling of 21116203623652 in words is "twenty-one trillion, one hundred sixteen billion, two hundred three million, six hundred twenty-three thousand, six hundred fifty-two".