211211120021 has 8 divisors (see below), whose sum is σ = 230454219744. Its totient is φ = 191975035120.

The previous prime is 211211120009. The next prime is 211211120039. The reversal of 211211120021 is 120021112112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211211120021 - 2¹⁰ = 211211118997 is a prime.

It is a super-2 number, since 2×211211120021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211211119978 and 211211120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211211120621) 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, 1690646 + ... + 1811271.

It is an arithmetic number, because the mean of its divisors is an integer number (28806777468).

Almost surely, 2^211211120021 is an apocalyptic number.

It is an amenable number.

211211120021 is a deficient number, since it is larger than the sum of its proper divisors (19243099723).

211211120021 is a wasteful number, since it uses less digits than its factorization.

211211120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3507411.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211211120021 its reverse (120021112112), we get a palindrome (331232232133).

The spelling of 211211120021 in words is "two hundred eleven billion, two hundred eleven million, one hundred twenty thousand, twenty-one".