10821953 has 4 divisors (see below), whose sum is σ = 10841940. Its totient is φ = 10801968.

The previous prime is 10821947. The next prime is 10821971. The reversal of 10821953 is 35912801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 10452289 = 608^2 + 3233^2 .

It is a cyclic number.

It is not a de Polignac number, because 10821953 - 2¹⁴ = 10805569 is a prime.

It is a super-2 number, since 2×10821953² = 234229333468418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10821913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9158 + ... + 10271.

It is an arithmetic number, because the mean of its divisors is an integer number (2710485).

Almost surely, 2^10821953 is an apocalyptic number.

It is an amenable number.

10821953 is a deficient number, since it is larger than the sum of its proper divisors (19987).

10821953 is an equidigital number, since it uses as much as digits as its factorization.

10821953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19986.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 10821953 is about 3289.6736920248. The cubic root of 10821953 is about 221.1915580797.

The spelling of 10821953 in words is "ten million, eight hundred twenty-one thousand, nine hundred fifty-three".