21353801048639 has 2 divisors, whose sum is σ = 21353801048640. Its totient is φ = 21353801048638.

The previous prime is 21353801048603. The next prime is 21353801048677. The reversal of 21353801048639 is 93684010835312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21353801048639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21353801047639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676900524319 + 10676900524320.

It is an arithmetic number, because the mean of its divisors is an integer number (10676900524320).

Almost surely, 2^{21353801048639} is an apocalyptic number.

21353801048639 is a deficient number, since it is larger than the sum of its proper divisors (1).

21353801048639 is an equidigital number, since it uses as much as digits as its factorization.

21353801048639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 21353801048639 in words is "twenty-one trillion, three hundred fifty-three billion, eight hundred one million, forty-eight thousand, six hundred thirty-nine".