21122153 has 8 divisors (see below), whose sum is σ = 23362248. Its totient is φ = 18969984.

The previous prime is 21122111. The next prime is 21122161. The reversal of 21122153 is 35122112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6091024 + 15031129 = 2468^2 + 3877^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122153 - 2¹⁰ = 21121129 is a prime.

It is a super-2 number, since 2×21122153² = 892290694710818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21476 + ... + 22437.

It is an arithmetic number, because the mean of its divisors is an integer number (2920281).

Almost surely, 2^21122153 is an apocalyptic number.

It is an amenable number.

21122153 is a deficient number, since it is larger than the sum of its proper divisors (2240095).

21122153 is a wasteful number, since it uses less digits than its factorization.

21122153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43963.

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

The square root of 21122153 is about 4595.8843545068. The cubic root of 21122153 is about 276.4263216472.

Adding to 21122153 its reverse (35122112), we get a palindrome (56244265).

The spelling of 21122153 in words is "twenty-one million, one hundred twenty-two thousand, one hundred fifty-three".