21102211121001 has 16 divisors (see below), whose sum is σ = 29617395302400. Its totient is φ = 13327596687888.

The previous prime is 21102211120999. The next prime is 21102211121023. The reversal of 21102211121001 is 10012111220112.

It is a happy number.

It is not a de Polignac number, because 21102211121001 - 2¹ = 21102211120999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102211121501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5280600 + ... + 8371926.

It is an arithmetic number, because the mean of its divisors is an integer number (1851087206400).

Almost surely, 2^{21102211121001} is an apocalyptic number.

It is an amenable number.

21102211121001 is a deficient number, since it is larger than the sum of its proper divisors (8515184181399).

21102211121001 is a wasteful number, since it uses less digits than its factorization.

21102211121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211108.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21102211121001 its reverse (10012111220112), we get a palindrome (31114322341113).

The spelling of 21102211121001 in words is "twenty-one trillion, one hundred two billion, two hundred eleven million, one hundred twenty-one thousand, one".