21037700424646 has 16 divisors (see below), whose sum is σ = 31671827167968. Its totient is φ = 10480454208000.

The previous prime is 21037700424641. The next prime is 21037700424677. The reversal of 21037700424646 is 64642400773012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21037700424596 and 21037700424605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21037700424641) 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 7 ways as a sum of consecutive naturals, for example, 5948955 + ... + 8801446.

It is an arithmetic number, because the mean of its divisors is an integer number (1979489197998).

Almost surely, 2^{21037700424646} is an apocalyptic number.

21037700424646 is a deficient number, since it is larger than the sum of its proper divisors (10634126743322).

21037700424646 is a wasteful number, since it uses less digits than its factorization.

21037700424646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14753007.

The product of its (nonzero) digits is 1354752, while the sum is 46.

The spelling of 21037700424646 in words is "twenty-one trillion, thirty-seven billion, seven hundred million, four hundred twenty-four thousand, six hundred forty-six".