11211211120021 has 8 divisors (see below), whose sum is σ = 12874118032800. Its totient is φ = 9655588524240.

The previous prime is 11211211119967. The next prime is 11211211120111. The reversal of 11211211120021 is 12002111211211.

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 11211211120021 - 2¹⁵ = 11211211087253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211211119977 and 11211211120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211211220021) 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, 26821079026 + ... + 26821079443.

It is an arithmetic number, because the mean of its divisors is an integer number (1609264754100).

Almost surely, 2^{11211211120021} is an apocalyptic number.

11211211120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11211211120021 is a deficient number, since it is larger than the sum of its proper divisors (1662906912779).

11211211120021 is a wasteful number, since it uses less digits than its factorization.

11211211120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53642158499.

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

Adding to 11211211120021 its reverse (12002111211211), we get a palindrome (23213322331232).

The spelling of 11211211120021 in words is "eleven trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty thousand, twenty-one".