21111101007 has 8 divisors (see below), whose sum is σ = 29803907376. Its totient is φ = 13246180992.

The previous prime is 21111100981. The next prime is 21111101009. The reversal of 21111101007 is 70010111112.

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

It is not a de Polignac number, because 21111101007 - 2¹⁰ = 21111099983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111101009) 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, 206971528 + ... + 206971629.

It is an arithmetic number, because the mean of its divisors is an integer number (3725488422).

Almost surely, 2^21111101007 is an apocalyptic number.

21111101007 is a deficient number, since it is larger than the sum of its proper divisors (8692806369).

21111101007 is a wasteful number, since it uses less digits than its factorization.

21111101007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413943177.

The product of its (nonzero) digits is 14, while the sum is 15.

Adding to 21111101007 its reverse (70010111112), we get a palindrome (91121212119).

The spelling of 21111101007 in words is "twenty-one billion, one hundred eleven million, one hundred one thousand, seven".