21060365420 has 48 divisors (see below), whose sum is σ = 45318393120. Its totient is φ = 8216764416.

The previous prime is 21060365383. The next prime is 21060365477. The reversal of 21060365420 is 2456306012.

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 15 ways as a sum of consecutive naturals, for example, 613676 + ... + 647084.

It is an arithmetic number, because the mean of its divisors is an integer number (944133190).

Almost surely, 2^21060365420 is an apocalyptic number.

21060365420 is a gapful number since it is divisible by the number (20) 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 21060365420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22659196560).

21060365420 is an abundant number, since it is smaller than the sum of its proper divisors (24258027700).

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

21060365420 is a wasteful number, since it uses less digits than its factorization.

21060365420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34194 (or 34192 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 21060365420 in words is "twenty-one billion, sixty million, three hundred sixty-five thousand, four hundred twenty".