211211221211021 has 8 divisors (see below), whose sum is σ = 212476398208704. Its totient is φ = 209946049441600.

The previous prime is 211211221210987. The next prime is 211211221211047. The reversal of 211211221211021 is 120112122112112.

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 211211221211021 - 2³⁸ = 210936343304077 is a prime.

It is a super-2 number, since 2×211211221211021² (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 = 211211221210984 and 211211221211002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211221511021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106069061 + ... + 108041973.

It is an arithmetic number, because the mean of its divisors is an integer number (26559549776088).

Almost surely, 2^{211211221211021} is an apocalyptic number.

It is an amenable number.

211211221211021 is a deficient number, since it is larger than the sum of its proper divisors (1265176997683).

211211221211021 is a wasteful number, since it uses less digits than its factorization.

211211221211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614131.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211211221211021 its reverse (120112122112112), we get a palindrome (331323343323133).

The spelling of 211211221211021 in words is "two hundred eleven trillion, two hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, twenty-one".