21161052 has 36 divisors (see below), whose sum is σ = 58354296. Its totient is φ = 6412320.

The previous prime is 21161051. The next prime is 21161059. The reversal of 21161052 is 25016112.

21161052 is a `hidden beast` number, since 2 + 1 + 1 + 610 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26323 + ... + 27114.

Almost surely, 2^21161052 is an apocalyptic number.

21161052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21161052 is an abundant number, since it is smaller than the sum of its proper divisors (37193244).

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

21161052 is a wasteful number, since it uses less digits than its factorization.

21161052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53458 (or 53453 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 21161052 is about 4600.1143464049. The cubic root of 21161052 is about 276.5959084222.

Adding to 21161052 its reverse (25016112), we get a palindrome (46177164).

The spelling of 21161052 in words is "twenty-one million, one hundred sixty-one thousand, fifty-two".