21035351424 has 64 divisors (see below), whose sum is σ = 55969982640. Its totient is φ = 6999883776.

The previous prime is 21035351399. The next prime is 21035351461. The reversal of 21035351424 is 42415353012.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 21035351391 and 21035351400.

It is a congruent number.

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, 181524 + ... + 273900.

Almost surely, 2^21035351424 is an apocalyptic number.

21035351424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21035351424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27984991320).

21035351424 is an abundant number, since it is smaller than the sum of its proper divisors (34934631216).

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

21035351424 is an equidigital number, since it uses as much as digits as its factorization.

21035351424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92987 (or 92975 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21035351424 in words is "twenty-one billion, thirty-five million, three hundred fifty-one thousand, four hundred twenty-four".