21111331101 has 8 divisors (see below), whose sum is σ = 32169647424. Its totient is φ = 12063617760.

The previous prime is 21111331027. The next prime is 21111331201. The reversal of 21111331101 is 10113311112.

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

It is not a de Polignac number, because 21111331101 - 2⁹ = 21111330589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111331201) 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, 502650720 + ... + 502650761.

It is an arithmetic number, because the mean of its divisors is an integer number (4021205928).

Almost surely, 2^21111331101 is an apocalyptic number.

21111331101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21111331101 is a deficient number, since it is larger than the sum of its proper divisors (11058316323).

21111331101 is a wasteful number, since it uses less digits than its factorization.

21111331101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005301491.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 21111331101 its reverse (10113311112), we get a palindrome (31224642213).

The spelling of 21111331101 in words is "twenty-one billion, one hundred eleven million, three hundred thirty-one thousand, one hundred one".