21020115882 has 16 divisors (see below), whose sum is σ = 42047684640. Its totient is φ = 7005463152.

The previous prime is 21020115869. The next prime is 21020115899. The reversal of 21020115882 is 28851102012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273532 + ... + 341847.

It is an arithmetic number, because the mean of its divisors is an integer number (2627980290).

Almost surely, 2^21020115882 is an apocalyptic number.

21020115882 is an abundant number, since it is smaller than the sum of its proper divisors (21027568758).

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

21020115882 is a wasteful number, since it uses less digits than its factorization.

21020115882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621077.

The product of its (nonzero) digits is 2560, while the sum is 30.

Adding to 21020115882 its reverse (28851102012), we get a palindrome (49871217894).

The spelling of 21020115882 in words is "twenty-one billion, twenty million, one hundred fifteen thousand, eight hundred eighty-two".