21430141 has 8 divisors (see below), whose sum is σ = 22130744. Its totient is φ = 20736000.

The previous prime is 21430139. The next prime is 21430147. The reversal of 21430141 is 14103412.

It can be written as a sum of positive squares in 4 ways, for example, as 4995225 + 16434916 = 2235^2 + 4054^2 .

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

It is a 6-Lehmer number, since φ(21430141) divides (21430141-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 21430141 - 2¹ = 21430139 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430147) 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, 5641 + ... + 8641.

It is an arithmetic number, because the mean of its divisors is an integer number (2766343).

Almost surely, 2^21430141 is an apocalyptic number.

It is an amenable number.

21430141 is a deficient number, since it is larger than the sum of its proper divisors (700603).

21430141 is a wasteful number, since it uses less digits than its factorization.

21430141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3231.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21430141 is about 4629.2700288490. The cubic root of 21430141 is about 277.7633935603.

Adding to 21430141 its reverse (14103412), we get a palindrome (35533553).

The spelling of 21430141 in words is "twenty-one million, four hundred thirty thousand, one hundred forty-one".