21421500246 has 56 divisors (see below), whose sum is σ = 48717939240. Its totient is φ = 7060226976.

The previous prime is 21421500227. The next prime is 21421500251. The reversal of 21421500246 is 64200512412.

21421500246 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 27 ways as a sum of consecutive naturals, for example, 47221 + ... + 212303.

Almost surely, 2^21421500246 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21421500246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24358969620).

21421500246 is an abundant number, since it is smaller than the sum of its proper divisors (27296438994).

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

21421500246 is an equidigital number, since it uses as much as digits as its factorization.

21421500246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165192 (or 165177 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The spelling of 21421500246 in words is "twenty-one billion, four hundred twenty-one million, five hundred thousand, two hundred forty-six".