111011211220021 has 8 divisors (see below), whose sum is σ = 126870074458304. Its totient is φ = 95152377676320.

The previous prime is 111011211220009. The next prime is 111011211220031. The reversal of 111011211220021 is 120022112110111.

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 111011211220021 - 2¹³ = 111011211211829 is a prime.

It is a super-2 number, since 2×111011211220021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111011211219977 and 111011211220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111011211220031) 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, 1265281 + ... + 14954041.

It is an arithmetic number, because the mean of its divisors is an integer number (15858759307288).

Almost surely, 2^{111011211220021} is an apocalyptic number.

It is an amenable number.

111011211220021 is a deficient number, since it is larger than the sum of its proper divisors (15858863238283).

111011211220021 is a wasteful number, since it uses less digits than its factorization.

111011211220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14847291.

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

Adding to 111011211220021 its reverse (120022112110111), we get a palindrome (231033323330132).

The spelling of 111011211220021 in words is "one hundred eleven trillion, eleven billion, two hundred eleven million, two hundred twenty thousand, twenty-one".