20213101 has 4 divisors (see below), whose sum is σ = 20392092. Its totient is φ = 20034112.

The previous prime is 20213099. The next prime is 20213107. The reversal of 20213101 is 10131202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10131202 = 2 ⋅5065601.

It can be written as a sum of positive squares in 2 ways, for example, as 3802500 + 16410601 = 1950^2 + 4051^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213101 - 2¹ = 20213099 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 (20213107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89326 + ... + 89551.

It is an arithmetic number, because the mean of its divisors is an integer number (5098023).

Almost surely, 2^20213101 is an apocalyptic number.

It is an amenable number.

20213101 is a deficient number, since it is larger than the sum of its proper divisors (178991).

20213101 is a wasteful number, since it uses less digits than its factorization.

20213101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178990.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20213101 is about 4495.8982417310. The cubic root of 20213101 is about 272.4024328765.

Adding to 20213101 its reverse (10131202), we get a palindrome (30344303).

The spelling of 20213101 in words is "twenty million, two hundred thirteen thousand, one hundred one".