21121201001101 has 8 divisors (see below), whose sum is σ = 21394227193920. Its totient is φ = 20849897371488.

The previous prime is 21121201001093. The next prime is 21121201001123. The reversal of 21121201001101 is 10110010212112.

It is a happy number.

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 21121201001101 - 2³ = 21121201001093 is a prime.

It is a super-2 number, since 2×21121201001101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121201001501) 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, 430616121 + ... + 430665166.

It is an arithmetic number, because the mean of its divisors is an integer number (2674278399240).

Almost surely, 2^{21121201001101} is an apocalyptic number.

It is an amenable number.

21121201001101 is a deficient number, since it is larger than the sum of its proper divisors (273026192819).

21121201001101 is a wasteful number, since it uses less digits than its factorization.

21121201001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861281603.

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

Adding to 21121201001101 its reverse (10110010212112), we get a palindrome (31231211213213).

The spelling of 21121201001101 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred one million, one thousand, one hundred one".