100213561 has 8 divisors (see below), whose sum is σ = 114691904. Its totient is φ = 85775760.

The previous prime is 100213511. The next prime is 100213583. The reversal of 100213561 is 165312001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100213561 - 2⁷ = 100213433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100213511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4635 + ... + 14896.

It is an arithmetic number, because the mean of its divisors is an integer number (14336488).

Almost surely, 2^100213561 is an apocalyptic number.

It is an amenable number.

100213561 is a deficient number, since it is larger than the sum of its proper divisors (14478343).

100213561 is an equidigital number, since it uses as much as digits as its factorization.

100213561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20271.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 100213561 is about 10010.6723550419. The cubic root of 100213561 is about 464.4890692076.

Adding to 100213561 its reverse (165312001), we get a palindrome (265525562).

The spelling of 100213561 in words is "one hundred million, two hundred thirteen thousand, five hundred sixty-one".