21150035233556 has 24 divisors (see below), whose sum is σ = 37042522968360. Its totient is φ = 10566457800192.

The previous prime is 21150035233529. The next prime is 21150035233559. The reversal of 21150035233556 is 65533253005112.

It can be written as a sum of positive squares in 4 ways, for example, as 7463365031056 + 13686670202500 = 2731916^2 + 3699550^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150035233559) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 222882536 + ... + 222977408.

It is an arithmetic number, because the mean of its divisors is an integer number (1543438457015).

Almost surely, 2^{21150035233556} is an apocalyptic number.

It is an amenable number.

21150035233556 is a deficient number, since it is larger than the sum of its proper divisors (15892487734804).

21150035233556 is a wasteful number, since it uses less digits than its factorization.

21150035233556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139403 (or 139401 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 41.

Adding to 21150035233556 its reverse (65533253005112), we get a palindrome (86683288238668).

The spelling of 21150035233556 in words is "twenty-one trillion, one hundred fifty billion, thirty-five million, two hundred thirty-three thousand, five hundred fifty-six".