21001011001222 has 8 divisors (see below), whose sum is σ = 36001733144976. Its totient is φ = 9000433286232.

The previous prime is 21001011001213. The next prime is 21001011001249. The reversal of 21001011001222 is 22210011010012.

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

It is a congruent number.

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, 750036107173 + ... + 750036107200.

It is an arithmetic number, because the mean of its divisors is an integer number (4500216643122).

Almost surely, 2^{21001011001222} is an apocalyptic number.

21001011001222 is a deficient number, since it is larger than the sum of its proper divisors (15000722143754).

21001011001222 is a wasteful number, since it uses less digits than its factorization.

21001011001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500072214382.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001011001222 its reverse (22210011010012), we get a palindrome (43211022011234).

The spelling of 21001011001222 in words is "twenty-one trillion, one billion, eleven million, one thousand, two hundred twenty-two".