21021111221002 has 8 divisors (see below), whose sum is σ = 31534052561316. Its totient is φ = 10509760367232.

The previous prime is 21021111220987. The next prime is 21021111221057. The reversal of 21021111221002 is 20012211112012.

It can be written as a sum of positive squares in 2 ways, for example, as 18732181268761 + 2288929952241 = 4328069^2 + 1512921^2 .

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

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, 397588593 + ... + 397641460.

Almost surely, 2^{21021111221002} is an apocalyptic number.

21021111221002 is a deficient number, since it is larger than the sum of its proper divisors (10512941340314).

21021111221002 is a wasteful number, since it uses less digits than its factorization.

21021111221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795243272.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021111221002 its reverse (20012211112012), we get a palindrome (41033322333014).

The spelling of 21021111221002 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, two".