21012101211011 has 8 divisors (see below), whose sum is σ = 21659720163840. Its totient is φ = 20372838632008.

The previous prime is 21012101211007. The next prime is 21012101211029. The reversal of 21012101211011 is 11011210121012.

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 21012101211011 - 2² = 21012101211007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012101211511) 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, 2089088351 + ... + 2089098408.

It is an arithmetic number, because the mean of its divisors is an integer number (2707465020480).

Almost surely, 2^{21012101211011} is an apocalyptic number.

21012101211011 is a deficient number, since it is larger than the sum of its proper divisors (647618952829).

21012101211011 is a wasteful number, since it uses less digits than its factorization.

21012101211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178186913.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21012101211011 its reverse (11011210121012), we get a palindrome (32023311332023).

It can be divided in two parts, 210121012 and 11011, that multiplied together give a palindrome (2313642463132).

The spelling of 21012101211011 in words is "twenty-one trillion, twelve billion, one hundred one million, two hundred eleven thousand, eleven".