21082141 has 4 divisors (see below), whose sum is σ = 21091900. Its totient is φ = 21072384.

The previous prime is 21082133. The next prime is 21082147. The reversal of 21082141 is 14128012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3818116 + 17264025 = 1954^2 + 4155^2 .

It is a cyclic number.

It is not a de Polignac number, because 21082141 - 2³ = 21082133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36 + ... + 6493.

It is an arithmetic number, because the mean of its divisors is an integer number (5272975).

Almost surely, 2^21082141 is an apocalyptic number.

It is an amenable number.

21082141 is a deficient number, since it is larger than the sum of its proper divisors (9759).

21082141 is an equidigital number, since it uses as much as digits as its factorization.

21082141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9758.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 21082141 is about 4591.5292659418. The cubic root of 21082141 is about 276.2516651893.

The spelling of 21082141 in words is "twenty-one million, eighty-two thousand, one hundred forty-one".