221210100023 has 4 divisors (see below), whose sum is σ = 241320109128. Its totient is φ = 201100090920.

The previous prime is 221210099939. The next prime is 221210100037. The reversal of 221210100023 is 320001012122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221210100023 - 2¹⁰ = 221210098999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221210099980 and 221210100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210100323) 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, 10055004536 + ... + 10055004557.

It is an arithmetic number, because the mean of its divisors is an integer number (60330027282).

Almost surely, 2^221210100023 is an apocalyptic number.

221210100023 is a deficient number, since it is larger than the sum of its proper divisors (20110009105).

221210100023 is a wasteful number, since it uses less digits than its factorization.

221210100023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20110009104.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 221210100023 its reverse (320001012122), we get a palindrome (541211112145).

The spelling of 221210100023 in words is "two hundred twenty-one billion, two hundred ten million, one hundred thousand, twenty-three".