21141207 has 6 divisors (see below), whose sum is σ = 30537312. Its totient is φ = 14094132.

The previous prime is 21141161. The next prime is 21141227. The reversal of 21141207 is 70214112.

It is not a de Polignac number, because 21141207 - 2⁶ = 21141143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21141207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141227) 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 5 ways as a sum of consecutive naturals, for example, 1174503 + ... + 1174520.

It is an arithmetic number, because the mean of its divisors is an integer number (5089552).

Almost surely, 2^21141207 is an apocalyptic number.

21141207 is a deficient number, since it is larger than the sum of its proper divisors (9396105).

21141207 is a wasteful number, since it uses less digits than its factorization.

21141207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349029 (or 2349026 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21141207 is about 4597.9568288534. The cubic root of 21141207 is about 276.5094167773.

Adding to 21141207 its reverse (70214112), we get a palindrome (91355319).

It can be divided in two parts, 2114 and 1207, that added together give a triangular number (3321 = T₈₁).

The spelling of 21141207 in words is "twenty-one million, one hundred forty-one thousand, two hundred seven".