213720101 has 8 divisors (see below), whose sum is σ = 244882560. Its totient is φ = 182715408.

The previous prime is 213720097. The next prime is 213720109. The reversal of 213720101 is 101027312.

213720101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 213720101 - 2² = 213720097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213720101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213720109) 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, 36521 + ... + 41966.

It is an arithmetic number, because the mean of its divisors is an integer number (30610320).

Almost surely, 2^213720101 is an apocalyptic number.

It is an amenable number.

213720101 is a deficient number, since it is larger than the sum of its proper divisors (31162459).

213720101 is an equidigital number, since it uses as much as digits as its factorization.

213720101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78883.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 213720101 is about 14619.1689572287. The cubic root of 213720101 is about 597.8815112197.

Adding to 213720101 its reverse (101027312), we get a palindrome (314747413).

The spelling of 213720101 in words is "two hundred thirteen million, seven hundred twenty thousand, one hundred one".