21246247343684 has 96 divisors (see below), whose sum is σ = 43401764431872. Its totient is φ = 9002857248000.

The previous prime is 21246247343611. The next prime is 21246247343689. The reversal of 21246247343684 is 48634374264212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21246247343689) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 39857999 + ... + 40387529.

It is an arithmetic number, because the mean of its divisors is an integer number (452101712832).

Almost surely, 2^{21246247343684} is an apocalyptic number.

It is an amenable number.

21246247343684 is an abundant number, since it is smaller than the sum of its proper divisors (22155517088188).

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

21246247343684 is a wasteful number, since it uses less digits than its factorization.

21246247343684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530577 (or 530575 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 56.

The spelling of 21246247343684 in words is "twenty-one trillion, two hundred forty-six billion, two hundred forty-seven million, three hundred forty-three thousand, six hundred eighty-four".