21150036660650 has 48 divisors (see below), whose sum is σ = 40404897771480. Its totient is φ = 8230833561600.

The previous prime is 21150036660637. The next prime is 21150036660677. The reversal of 21150036660650 is 5606663005112.

It can be written as a sum of positive squares in 12 ways, for example, as 73279031401 + 21076757629249 = 270701^2 + 4590943^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21150036660598 and 21150036660607.

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 23 ways as a sum of consecutive naturals, for example, 28885070 + ... + 29608230.

Almost surely, 2^{21150036660650} is an apocalyptic number.

21150036660650 is a deficient number, since it is larger than the sum of its proper divisors (19254861110830).

21150036660650 is a wasteful number, since it uses less digits than its factorization.

21150036660650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739019 (or 739014 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

Adding to 21150036660650 its reverse (5606663005112), we get a palindrome (26756699665762).

The spelling of 21150036660650 in words is "twenty-one trillion, one hundred fifty billion, thirty-six million, six hundred sixty thousand, six hundred fifty".