21990232555516 has 24 divisors (see below), whose sum is σ = 38698829825040. Its totient is φ = 10933427001600.

The previous prime is 21990232555451. The next prime is 21990232555549. The reversal of 21990232555516 is 61555523209912.

21990232555516 is nontrivially palindromic in base 8.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (41) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31170196 + ... + 31867876.

It is an arithmetic number, because the mean of its divisors is an integer number (1612451242710).

Almost surely, 2^{21990232555516} is an apocalyptic number.

It is an amenable number.

21990232555516 is a deficient number, since it is larger than the sum of its proper divisors (16708597269524).

21990232555516 is a wasteful number, since it uses less digits than its factorization.

21990232555516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741885 (or 741883 counting only the distinct ones).

The product of its (nonzero) digits is 7290000, while the sum is 55.

The spelling of 21990232555516 in words is "twenty-one trillion, nine hundred ninety billion, two hundred thirty-two million, five hundred fifty-five thousand, five hundred sixteen".