64220636420421 has 32 divisors (see below), whose sum is σ = 92953676648448. Its totient is φ = 39203582584320.

The previous prime is 64220636420393. The next prime is 64220636420429. The reversal of 64220636420421 is 12402463602246.

It is not a de Polignac number, because 64220636420421 - 2¹¹ = 64220636418373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64220636420429) 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, 33729601 + ... + 35582681.

It is an arithmetic number, because the mean of its divisors is an integer number (2904802395264).

Almost surely, 2^{64220636420421} is an apocalyptic number.

It is an amenable number.

64220636420421 is a deficient number, since it is larger than the sum of its proper divisors (28733040228027).

64220636420421 is a wasteful number, since it uses less digits than its factorization.

64220636420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860221.

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 64220636420421 in words is "sixty-four trillion, two hundred twenty billion, six hundred thirty-six million, four hundred twenty thousand, four hundred twenty-one".