21029411784 has 32 divisors (see below), whose sum is σ = 53796172320. Its totient is φ = 6846784896.

The previous prime is 21029411779. The next prime is 21029411807. The reversal of 21029411784 is 48711492012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10187637 + ... + 10189700.

It is an arithmetic number, because the mean of its divisors is an integer number (1681130385).

Almost surely, 2^21029411784 is an apocalyptic number.

21029411784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21029411784 is an abundant number, since it is smaller than the sum of its proper divisors (32766760536).

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

21029411784 is a wasteful number, since it uses less digits than its factorization.

21029411784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20377389 (or 20377385 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 21029411784 in words is "twenty-one billion, twenty-nine million, four hundred eleven thousand, seven hundred eighty-four".