211221023293 has 16 divisors (see below), whose sum is σ = 242429829120. Its totient is φ = 180272275056.

The previous prime is 211221023291. The next prime is 211221023399. The reversal of 211221023293 is 392320122112.

It is a cyclic number.

It is not a de Polignac number, because 211221023293 - 2¹ = 211221023291 is a prime.

It is a super-2 number, since 2×211221023293² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221023291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1685980 + ... + 1806922.

It is an arithmetic number, because the mean of its divisors is an integer number (15151864320).

Almost surely, 2^211221023293 is an apocalyptic number.

It is an amenable number.

211221023293 is a deficient number, since it is larger than the sum of its proper divisors (31208805827).

211221023293 is a wasteful number, since it uses less digits than its factorization.

211221023293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122016.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 211221023293 in words is "two hundred eleven billion, two hundred twenty-one million, twenty-three thousand, two hundred ninety-three".