21111001001002 has 8 divisors (see below), whose sum is σ = 34545274365312. Its totient is φ = 9595909545900.

The previous prime is 21111001000967. The next prime is 21111001001047. The reversal of 21111001001002 is 20010010011112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21111001001002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479795477274 + ... + 479795477317.

It is an arithmetic number, because the mean of its divisors is an integer number (4318159295664).

Almost surely, 2^{21111001001002} is an apocalyptic number.

21111001001002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111001001002 is a deficient number, since it is larger than the sum of its proper divisors (13434273364310).

21111001001002 is a wasteful number, since it uses less digits than its factorization.

21111001001002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959590954604.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21111001001002 its reverse (20010010011112), we get a palindrome (41121011012114).

The spelling of 21111001001002 in words is "twenty-one trillion, one hundred eleven billion, one million, one thousand, two".