21121352 has 24 divisors (see below), whose sum is σ = 46069110. Its totient is φ = 9051840.

The previous prime is 21121349. The next prime is 21121363. The reversal of 21121352 is 25312112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17757796 + 3363556 = 4214^2 + 1834^2 .

It is a super-2 number, since 2×21121352² = 892223020615808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121352.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26549 + ... + 27332.

Almost surely, 2^21121352 is an apocalyptic number.

It is an amenable number.

21121352 is an abundant number, since it is smaller than the sum of its proper divisors (24947758).

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

21121352 is a wasteful number, since it uses less digits than its factorization.

21121352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53901 (or 53890 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 21121352 is about 4595.7972104957. The cubic root of 21121352 is about 276.4228273651.

Adding to 21121352 its reverse (25312112), we get a palindrome (46433464).

The spelling of 21121352 in words is "twenty-one million, one hundred twenty-one thousand, three hundred fifty-two".