100776481561021 has 16 divisors (see below), whose sum is σ = 121974389858304. Its totient is φ = 81390999097584.

The previous prime is 100776481561009. The next prime is 100776481561033. The reversal of 100776481561021 is 120165184677001.

It is an interprime number because it is at equal distance from previous prime (100776481561009) and next prime (100776481561033).

It is a cyclic number.

It is not a de Polignac number, because 100776481561021 - 2¹⁵ = 100776481528253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100776481561051) 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, 4671189805 + ... + 4671211378.

It is an arithmetic number, because the mean of its divisors is an integer number (7623399366144).

Almost surely, 2^{100776481561021} is an apocalyptic number.

It is an amenable number.

100776481561021 is a deficient number, since it is larger than the sum of its proper divisors (21197908297283).

100776481561021 is an equidigital number, since it uses as much as digits as its factorization.

100776481561021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9342401280.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 100776481561021 in words is "one hundred trillion, seven hundred seventy-six billion, four hundred eighty-one million, five hundred sixty-one thousand, twenty-one".