211020212121 has 8 divisors (see below), whose sum is σ = 281362663104. Its totient is φ = 140678951280.

The previous prime is 211020212119. The next prime is 211020212153. The reversal of 211020212121 is 121212020112.

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

It is not a de Polignac number, because 211020212121 - 2¹ = 211020212119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211020212121.

It is not an unprimeable number, because it can be changed into a prime (211020212111) 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, 271836 + ... + 704226.

It is an arithmetic number, because the mean of its divisors is an integer number (35170332888).

Almost surely, 2^211020212121 is an apocalyptic number.

It is an amenable number.

211020212121 is a deficient number, since it is larger than the sum of its proper divisors (70342450983).

211020212121 is a wasteful number, since it uses less digits than its factorization.

211020212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595071.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211020212121 its reverse (121212020112), we get a palindrome (332232232233).

The spelling of 211020212121 in words is "two hundred eleven billion, twenty million, two hundred twelve thousand, one hundred twenty-one".