21101021223 has 8 divisors (see below), whose sum is σ = 28136172288. Its totient is φ = 14066608824.

The previous prime is 21101021203. The next prime is 21101021243. The reversal of 21101021223 is 32212010112.

It is an interprime number because it is at equal distance from previous prime (21101021203) and next prime (21101021243).

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

It is not a de Polignac number, because 21101021223 - 2⁹ = 21101020711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101021203) 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, 114165 + ... + 235022.

It is an arithmetic number, because the mean of its divisors is an integer number (3517021536).

Almost surely, 2^21101021223 is an apocalyptic number.

21101021223 is a deficient number, since it is larger than the sum of its proper divisors (7035151065).

21101021223 is a wasteful number, since it uses less digits than its factorization.

21101021223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369333.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21101021223 its reverse (32212010112), we get a palindrome (53313031335).

The spelling of 21101021223 in words is "twenty-one billion, one hundred one million, twenty-one thousand, two hundred twenty-three".