21001110021201 has 8 divisors (see below), whose sum is σ = 28001679334720. Its totient is φ = 14000640360912.

The previous prime is 21001110021107. The next prime is 21001110021233. The reversal of 21001110021201 is 10212001110012.

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

It is not a de Polignac number, because 21001110021201 - 2¹⁸ = 21001109759057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21008110021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24420181 + ... + 25265538.

It is an arithmetic number, because the mean of its divisors is an integer number (3500209916840).

Almost surely, 2^{21001110021201} is an apocalyptic number.

It is an amenable number.

21001110021201 is a deficient number, since it is larger than the sum of its proper divisors (7000569313519).

21001110021201 is a wasteful number, since it uses less digits than its factorization.

21001110021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49826615.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001110021201 its reverse (10212001110012), we get a palindrome (31213111131213).

The spelling of 21001110021201 in words is "twenty-one trillion, one billion, one hundred ten million, twenty-one thousand, two hundred one".