100220721615 has 48 divisors (see below), whose sum is σ = 198554923008. Its totient is φ = 45810007488.

The previous prime is 100220721541. The next prime is 100220721647. The reversal of 100220721615 is 516127022001.

100220721615 is a `hidden beast` number, since 1 + 0 + 0 + 2 + 20 + 7 + 21 + 615 = 666.

It is not a de Polignac number, because 100220721615 - 2⁹ = 100220721103 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4930002 + ... + 4950288.

It is an arithmetic number, because the mean of its divisors is an integer number (4136560896).

Almost surely, 2^100220721615 is an apocalyptic number.

100220721615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

100220721615 is a deficient number, since it is larger than the sum of its proper divisors (98334201393).

100220721615 is a wasteful number, since it uses less digits than its factorization.

100220721615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35988 (or 35985 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 100220721615 its reverse (516127022001), we get a palindrome (616347743616).

The spelling of 100220721615 in words is "one hundred billion, two hundred twenty million, seven hundred twenty-one thousand, six hundred fifteen".