21530214402 has 16 divisors (see below), whose sum is σ = 43062449472. Its totient is φ = 7176401360.

The previous prime is 21530214389. The next prime is 21530214403. The reversal of 21530214402 is 20441203512.

It is not an unprimeable number, because it can be changed into a prime (21530214403) 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, 78508 + ... + 221864.

It is an arithmetic number, because the mean of its divisors is an integer number (2691403092).

Almost surely, 2^21530214402 is an apocalyptic number.

21530214402 is an abundant number, since it is smaller than the sum of its proper divisors (21532235070).

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

21530214402 is a wasteful number, since it uses less digits than its factorization.

21530214402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168393.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21530214402 its reverse (20441203512), we get a palindrome (41971417914).

The spelling of 21530214402 in words is "twenty-one billion, five hundred thirty million, two hundred fourteen thousand, four hundred two".