21041430 has 32 divisors (see below), whose sum is σ = 51577344. Its totient is φ = 5491296.

The previous prime is 21041429. The next prime is 21041437. The reversal of 21041430 is 3414012.

21041430 = T₃₇₆ + T₃₇₇ + ... + T₅₆₃.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6052 + ... + 8871.

It is an arithmetic number, because the mean of its divisors is an integer number (1611792).

Almost surely, 2^21041430 is an apocalyptic number.

21041430 is an abundant number, since it is smaller than the sum of its proper divisors (30535914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21041430 is a wasteful number, since it uses less digits than its factorization.

21041430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14980.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21041430 is about 4587.0938512309. The cubic root of 21041430 is about 276.0737305644.

Adding to 21041430 its reverse (3414012), we get a palindrome (24455442).

The spelling of 21041430 in words is "twenty-one million, forty-one thousand, four hundred thirty".