21111002 has 16 divisors (see below), whose sum is σ = 35113824. Its totient is φ = 9438000.

The previous prime is 21110989. The next prime is 21111007. The reversal of 21111002 is 20011112.

It is not an unprimeable number, because it can be changed into a prime (21111007) 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, 6524 + ... + 9207.

It is an arithmetic number, because the mean of its divisors is an integer number (2194614).

Almost surely, 2^21111002 is an apocalyptic number.

21111002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111002 is a deficient number, since it is larger than the sum of its proper divisors (14002822).

21111002 is a wasteful number, since it uses less digits than its factorization.

21111002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15805.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 21111002 is about 4594.6710437201. The cubic root of 21111002 is about 276.3776685813.

Adding to 21111002 its reverse (20011112), we get a palindrome (41122114).

It can be divided in two parts, 2111 and 1002, that added together give a palindrome (3113).

The spelling of 21111002 in words is "twenty-one million, one hundred eleven thousand, two".