21111021002 has 8 divisors (see below), whose sum is σ = 31672649700. Its totient is φ = 10553471104.

The previous prime is 21111020977. The next prime is 21111021013. The reversal of 21111021002 is 20012011112.

It can be written as a sum of positive squares in 2 ways, for example, as 20765098201 + 345922801 = 144101^2 + 18599^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006727 + ... + 1027482.

Almost surely, 2^21111021002 is an apocalyptic number.

21111021002 is a deficient number, since it is larger than the sum of its proper divisors (10561628698).

21111021002 is a wasteful number, since it uses less digits than its factorization.

21111021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039400.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21111021002 its reverse (20012011112), we get a palindrome (41123032114).

The spelling of 21111021002 in words is "twenty-one billion, one hundred eleven million, twenty-one thousand, two".