21141087 has 16 divisors (see below), whose sum is σ = 31812480. Its totient is φ = 12370400.

The previous prime is 21141083. The next prime is 21141089. The reversal of 21141087 is 78014112.

It is a cyclic number.

It is not a de Polignac number, because 21141087 - 2² = 21141083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10089 + ... + 12002.

It is an arithmetic number, because the mean of its divisors is an integer number (1988280).

Almost surely, 2^21141087 is an apocalyptic number.

21141087 is a deficient number, since it is larger than the sum of its proper divisors (10671393).

21141087 is a wasteful number, since it uses less digits than its factorization.

21141087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22134.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 21141087 is about 4597.9437795606. The cubic root of 21141087 is about 276.5088936096.

Adding to 21141087 its reverse (78014112), we get a palindrome (99155199).

The spelling of 21141087 in words is "twenty-one million, one hundred forty-one thousand, eighty-seven".