21035350420 has 48 divisors (see below), whose sum is σ = 50956698240. Its totient is φ = 7144712064.

The previous prime is 21035350397. The next prime is 21035350481. The reversal of 21035350420 is 2405353012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 687135 + ... + 717094.

It is an arithmetic number, because the mean of its divisors is an integer number (1061597880).

Almost surely, 2^21035350420 is an apocalyptic number.

21035350420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21035350420 is an abundant number, since it is smaller than the sum of its proper divisors (29921347820).

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

21035350420 is a wasteful number, since it uses less digits than its factorization.

21035350420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404352 (or 1404350 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The spelling of 21035350420 in words is "twenty-one billion, thirty-five million, three hundred fifty thousand, four hundred twenty".