21621555034103 has 2 divisors, whose sum is σ = 21621555034104. Its totient is φ = 21621555034102.

The previous prime is 21621555034091. The next prime is 21621555034207. The reversal of 21621555034103 is 30143055512612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21621555034103 - 2⁴ = 21621555034087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21621555031103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810777517051 + 10810777517052.

It is an arithmetic number, because the mean of its divisors is an integer number (10810777517052).

Almost surely, 2^{21621555034103} is an apocalyptic number.

21621555034103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21621555034103 is an equidigital number, since it uses as much as digits as its factorization.

21621555034103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 21621555034103 in words is "twenty-one trillion, six hundred twenty-one billion, five hundred fifty-five million, thirty-four thousand, one hundred three".