8421555499811 has 16 divisors (see below), whose sum is σ = 8746695609120. Its totient is φ = 8101555925760.

The previous prime is 8421555499807. The next prime is 8421555499837. The reversal of 8421555499811 is 1189945551248.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8421555499811 - 2² = 8421555499807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421555499891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146084885 + ... + 146142521.

It is an arithmetic number, because the mean of its divisors is an integer number (546668475570).

Almost surely, 2^{8421555499811} is an apocalyptic number.

8421555499811 is a deficient number, since it is larger than the sum of its proper divisors (325140109309).

8421555499811 is a wasteful number, since it uses less digits than its factorization.

8421555499811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102134.

The product of its digits is 20736000, while the sum is 62.

The spelling of 8421555499811 in words is "eight trillion, four hundred twenty-one billion, five hundred fifty-five million, four hundred ninety-nine thousand, eight hundred eleven".