21276323420 has 48 divisors (see below), whose sum is σ = 50861357568. Its totient is φ = 7400458560.

The previous prime is 21276323413. The next prime is 21276323437. The reversal of 21276323420 is 2432367212.

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 15 ways as a sum of consecutive naturals, for example, 2097344 + ... + 2107463.

It is an arithmetic number, because the mean of its divisors is an integer number (1059611616).

Almost surely, 2^21276323420 is an apocalyptic number.

21276323420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21276323420 is an abundant number, since it is smaller than the sum of its proper divisors (29585034148).

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

21276323420 is a wasteful number, since it uses less digits than its factorization.

21276323420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4204850 (or 4204848 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 32.

The spelling of 21276323420 in words is "twenty-one billion, two hundred seventy-six million, three hundred twenty-three thousand, four hundred twenty".