21141969 has 16 divisors (see below), whose sum is σ = 29220864. Its totient is φ = 13582800.

The previous prime is 21141947. The next prime is 21141971. The reversal of 21141969 is 96914112.

It is not a de Polignac number, because 21141969 - 2⁸ = 21141713 is a prime.

It is a super-2 number, since 2×21141969² = 893965706393922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21141569) 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 15 ways as a sum of consecutive naturals, for example, 42814 + ... + 43304.

It is an arithmetic number, because the mean of its divisors is an integer number (1826304).

Almost surely, 2^21141969 is an apocalyptic number.

It is an amenable number.

21141969 is a deficient number, since it is larger than the sum of its proper divisors (8078895).

21141969 is a wasteful number, since it uses less digits than its factorization.

21141969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its digits is 3888, while the sum is 33.

The square root of 21141969 is about 4598.0396909988. The cubic root of 21141969 is about 276.5127388463.

The spelling of 21141969 in words is "twenty-one million, one hundred forty-one thousand, nine hundred sixty-nine".