21101223101 has 16 divisors (see below), whose sum is σ = 24546324480. Its totient is φ = 17766604800.

The previous prime is 21101223097. The next prime is 21101223131. The reversal of 21101223101 is 10132210112.

It is not a de Polignac number, because 21101223101 - 2² = 21101223097 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 (21101223131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27716 + ... + 207293.

It is an arithmetic number, because the mean of its divisors is an integer number (1534145280).

Almost surely, 2^21101223101 is an apocalyptic number.

It is an amenable number.

21101223101 is a deficient number, since it is larger than the sum of its proper divisors (3445101379).

21101223101 is a wasteful number, since it uses less digits than its factorization.

21101223101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235244.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21101223101 its reverse (10132210112), we get a palindrome (31233433213).

The spelling of 21101223101 in words is "twenty-one billion, one hundred one million, two hundred twenty-three thousand, one hundred one".