21141251 has 8 divisors (see below), whose sum is σ = 22906224. Its totient is φ = 19434240.

The previous prime is 21141233. The next prime is 21141257. The reversal of 21141251 is 15214112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21141251 - 2¹⁴ = 21124867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13730 + ... + 15191.

It is an arithmetic number, because the mean of its divisors is an integer number (2863278).

Almost surely, 2^21141251 is an apocalyptic number.

21141251 is a deficient number, since it is larger than the sum of its proper divisors (1764973).

21141251 is a wasteful number, since it uses less digits than its factorization.

21141251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28981.

The product of its digits is 80, while the sum is 17.

The square root of 21141251 is about 4597.9616135849. The cubic root of 21141251 is about 276.5096086050.

Adding to 21141251 its reverse (15214112), we get a palindrome (36355363).

The spelling of 21141251 in words is "twenty-one million, one hundred forty-one thousand, two hundred fifty-one".