21520611107150 has 12 divisors (see below), whose sum is σ = 40028336659392. Its totient is φ = 8608244442840.

The previous prime is 21520611107141. The next prime is 21520611107189. The reversal of 21520611107150 is 5170111602512.

It is a super-2 number, since 2×21520611107150² (a number of 27 digits) contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 215206111022 + ... + 215206111121.

It is an arithmetic number, because the mean of its divisors is an integer number (3335694721616).

Almost surely, 2^{21520611107150} is an apocalyptic number.

21520611107150 is a deficient number, since it is larger than the sum of its proper divisors (18507725552242).

21520611107150 is a wasteful number, since it uses less digits than its factorization.

21520611107150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430412222155 (or 430412222150 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 32.

Adding to 21520611107150 its reverse (5170111602512), we get a palindrome (26690722709662).

The spelling of 21520611107150 in words is "twenty-one trillion, five hundred twenty billion, six hundred eleven million, one hundred seven thousand, one hundred fifty".