100388219281 has 9 divisors (see below), whose sum is σ = 116780712681. Its totient is φ = 86045144052.

The previous prime is 100388219279. The next prime is 100388219297. The reversal of 100388219281 is 182912883001.

It is a happy number.

The square root of 100388219281 is 316841.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 100388219281 - 2¹ = 100388219279 is a prime.

It is a super-2 number, since 2×100388219281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100388219081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2195256 + ... + 2240518.

Almost surely, 2^100388219281 is an apocalyptic number.

100388219281 is the 316841-st square number.

100388219281 is the 158421-st centered octagonal number.

It is an amenable number.

100388219281 is a deficient number, since it is larger than the sum of its proper divisors (16392493400).

100388219281 is an frugal number, since it uses more digits than its factorization.

100388219281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90540 (or 45270 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 43.

The spelling of 100388219281 in words is "one hundred billion, three hundred eighty-eight million, two hundred nineteen thousand, two hundred eighty-one".