21400130 has 8 divisors (see below), whose sum is σ = 38520252. Its totient is φ = 8560048.

The previous prime is 21400121. The next prime is 21400151. The reversal of 21400130 is 3100412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21187609 + 212521 = 4603^2 + 461^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069997 + ... + 1070016.

Almost surely, 2^21400130 is an apocalyptic number.

21400130 is a deficient number, since it is larger than the sum of its proper divisors (17120122).

21400130 is a wasteful number, since it uses less digits than its factorization.

21400130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140020.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21400130 is about 4626.0274534421. The cubic root of 21400130 is about 277.6336720388.

Adding to 21400130 its reverse (3100412), we get a palindrome (24500542).

The spelling of 21400130 in words is "twenty-one million, four hundred thousand, one hundred thirty".