21123141 has 24 divisors (see below), whose sum is σ = 31042656. Its totient is φ = 12767040.

The previous prime is 21123133. The next prime is 21123143. The reversal of 21123141 is 14132112.

It is not a de Polignac number, because 21123141 - 2³ = 21123133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21123141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30586 + ... + 31268.

It is an arithmetic number, because the mean of its divisors is an integer number (1293444).

Almost surely, 2^21123141 is an apocalyptic number.

It is an amenable number.

21123141 is a deficient number, since it is larger than the sum of its proper divisors (9919515).

21123141 is a wasteful number, since it uses less digits than its factorization.

21123141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 760 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 21123141 is about 4595.9918407238. The cubic root of 21123141 is about 276.4306315763.

Adding to 21123141 its reverse (14132112), we get a palindrome (35255253).

It can be divided in two parts, 2112 and 3141, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 21123141 in words is "twenty-one million, one hundred twenty-three thousand, one hundred forty-one".