21299605026 has 32 divisors (see below), whose sum is σ = 48856869888. Its totient is φ = 6064094160.

The previous prime is 21299605013. The next prime is 21299605069. The reversal of 21299605026 is 62050699212.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 15 ways as a sum of consecutive naturals, for example, 884110 + ... + 907881.

It is an arithmetic number, because the mean of its divisors is an integer number (1526777184).

Almost surely, 2^21299605026 is an apocalyptic number.

21299605026 is an abundant number, since it is smaller than the sum of its proper divisors (27557264862).

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

21299605026 is a wasteful number, since it uses less digits than its factorization.

21299605026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792286.

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 21299605026 in words is "twenty-one billion, two hundred ninety-nine million, six hundred five thousand, twenty-six".