21311355101 has 8 divisors (see below), whose sum is σ = 21813499584. Its totient is φ = 20814821440.

The previous prime is 21311355041. The next prime is 21311355137. The reversal of 21311355101 is 10155311312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21311355101 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 (21311355151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395020 + ... + 1410213.

It is an arithmetic number, because the mean of its divisors is an integer number (2726687448).

Almost surely, 2^21311355101 is an apocalyptic number.

It is an amenable number.

21311355101 is a deficient number, since it is larger than the sum of its proper divisors (502144483).

21311355101 is a wasteful number, since it uses less digits than its factorization.

21311355101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805411.

The product of its (nonzero) digits is 450, while the sum is 23.

Adding to 21311355101 its reverse (10155311312), we get a palindrome (31466666413).

The spelling of 21311355101 in words is "twenty-one billion, three hundred eleven million, three hundred fifty-five thousand, one hundred one".