21101222001001 has 8 divisors (see below), whose sum is σ = 21149263102464. Its totient is φ = 21053182740720.

The previous prime is 21101222000953. The next prime is 21101222001023. The reversal of 21101222001001 is 10010022210112.

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

It is a cyclic number.

It is not a de Polignac number, because 21101222001001 - 2⁹ = 21101222000489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101222061001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23959480 + ... + 24824566.

It is an arithmetic number, because the mean of its divisors is an integer number (2643657887808).

Almost surely, 2^{21101222001001} is an apocalyptic number.

It is an amenable number.

21101222001001 is a deficient number, since it is larger than the sum of its proper divisors (48041101463).

21101222001001 is an equidigital number, since it uses as much as digits as its factorization.

21101222001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920591.

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

Adding to 21101222001001 its reverse (10010022210112), we get a palindrome (31111244211113).

The spelling of 21101222001001 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-two million, one thousand, one".