20621233104587 has 2 divisors, whose sum is σ = 20621233104588. Its totient is φ = 20621233104586.

The previous prime is 20621233104547. The next prime is 20621233104607. The reversal of 20621233104587 is 78540133212602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20621233104587 - 2²² = 20621228910283 is a prime.

It is not a weakly prime, because it can be changed into another prime (20621233104547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310616552293 + 10310616552294.

It is an arithmetic number, because the mean of its divisors is an integer number (10310616552294).

Almost surely, 2^{20621233104587} is an apocalyptic number.

20621233104587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20621233104587 is an equidigital number, since it uses as much as digits as its factorization.

20621233104587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 20621233104587 in words is "twenty trillion, six hundred twenty-one billion, two hundred thirty-three million, one hundred four thousand, five hundred eighty-seven".