21010111212001 has 8 divisors (see below), whose sum is σ = 21193404019200. Its totient is φ = 20827399365600.

The previous prime is 21010111211983. The next prime is 21010111212019. The reversal of 21010111212001 is 10021211101012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21010111211983) and next prime (21010111212019).

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 21010111212001 - 2²⁷ = 21009976994273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010111212061) 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, 145167556 + ... + 145312213.

It is an arithmetic number, because the mean of its divisors is an integer number (2649175502400).

Almost surely, 2^{21010111212001} is an apocalyptic number.

It is an amenable number.

21010111212001 is a deficient number, since it is larger than the sum of its proper divisors (183292807199).

21010111212001 is a wasteful number, since it uses less digits than its factorization.

21010111212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290480399.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21010111212001 its reverse (10021211101012), we get a palindrome (31031322313013).

The spelling of 21010111212001 in words is "twenty-one trillion, ten billion, one hundred eleven million, two hundred twelve thousand, one".