20621233104547 has 2 divisors, whose sum is σ = 20621233104548. Its totient is φ = 20621233104546.

The previous prime is 20621233104503. The next prime is 20621233104587. The reversal of 20621233104547 is 74540133212602.

It is an a-pointer prime, because the next prime (20621233104587) can be obtained adding 20621233104547 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20621233104547 is a prime.

It is not a weakly prime, because it can be changed into another prime (20621233104587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310616552273 + 10310616552274.

It is an arithmetic number, because the mean of its divisors is an integer number (10310616552274).

Almost surely, 2^{20621233104547} is an apocalyptic number.

20621233104547 is a deficient number, since it is larger than the sum of its proper divisors (1).

20621233104547 is an equidigital number, since it uses as much as digits as its factorization.

20621233104547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 20621233104547 in words is "twenty trillion, six hundred twenty-one billion, two hundred thirty-three million, one hundred four thousand, five hundred forty-seven".