21152111346 has 24 divisors (see below), whose sum is σ = 45869026320. Its totient is φ = 7044634296.

The previous prime is 21152111329. The next prime is 21152111347. The reversal of 21152111346 is 64311125112.

21152111346 is a `hidden beast` number, since 2 + 1 + 1 + 521 + 1 + 134 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (21152111347) 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 11 ways as a sum of consecutive naturals, for example, 484276 + ... + 526143.

It is an arithmetic number, because the mean of its divisors is an integer number (1911209430).

Almost surely, 2^21152111346 is an apocalyptic number.

21152111346 is an abundant number, since it is smaller than the sum of its proper divisors (24716914974).

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

21152111346 is a wasteful number, since it uses less digits than its factorization.

21152111346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011590 (or 1011587 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

Adding to 21152111346 its reverse (64311125112), we get a palindrome (85463236458).

The spelling of 21152111346 in words is "twenty-one billion, one hundred fifty-two million, one hundred eleven thousand, three hundred forty-six".