21436130 has 16 divisors (see below), whose sum is σ = 38824704. Its totient is φ = 8521200.

The previous prime is 21436117. The next prime is 21436147. The reversal of 21436130 is 3163412.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4946 + ... + 8205.

It is an arithmetic number, because the mean of its divisors is an integer number (2426544).

Almost surely, 2^21436130 is an apocalyptic number.

21436130 is a deficient number, since it is larger than the sum of its proper divisors (17388574).

21436130 is a wasteful number, since it uses less digits than its factorization.

21436130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13321.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21436130 is about 4629.9168459056. The cubic root of 21436130 is about 277.7892663100.

Adding to 21436130 its reverse (3163412), we get a palindrome (24599542).

The spelling of 21436130 in words is "twenty-one million, four hundred thirty-six thousand, one hundred thirty".