21379141 has 6 divisors (see below), whose sum is σ = 24869670. Its totient is φ = 18324936.

The previous prime is 21379129. The next prime is 21379157. The reversal of 21379141 is 14197312.

It can be written as a sum of positive squares in only one way, i.e., 17056900 + 4322241 = 4130^2 + 2079^2 .

It is not a de Polignac number, because 21379141 - 2⁵ = 21379109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21379441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218106 + ... + 218203.

It is an arithmetic number, because the mean of its divisors is an integer number (4144945).

Almost surely, 2^21379141 is an apocalyptic number.

It is an amenable number.

21379141 is a deficient number, since it is larger than the sum of its proper divisors (3490529).

21379141 is an equidigital number, since it uses as much as digits as its factorization.

21379141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436323 (or 436316 counting only the distinct ones).

The product of its digits is 1512, while the sum is 28.

The square root of 21379141 is about 4623.7583198087. The cubic root of 21379141 is about 277.5428757169.

The spelling of 21379141 in words is "twenty-one million, three hundred seventy-nine thousand, one hundred forty-one".