21046630187550 has 96 divisors (see below), whose sum is σ = 57123791771904. Its totient is φ = 5085807424000.

The previous prime is 21046630187549. The next prime is 21046630187563. The reversal of 21046630187550 is 5578103664012.

It is a self number, because there is not a number n which added to its sum of digits gives 21046630187550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19994139 + ... + 21020438.

It is an arithmetic number, because the mean of its divisors is an integer number (595039497624).

Almost surely, 2^{21046630187550} is an apocalyptic number.

21046630187550 is an abundant number, since it is smaller than the sum of its proper divisors (36077161584354).

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

21046630187550 is a wasteful number, since it uses less digits than its factorization.

21046630187550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41014914 (or 41014909 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 21046630187550 in words is "twenty-one trillion, forty-six billion, six hundred thirty million, one hundred eighty-seven thousand, five hundred fifty".