211220314221 has 16 divisors (see below), whose sum is σ = 329709760128. Its totient is φ = 117753484800.

The previous prime is 211220314187. The next prime is 211220314259. The reversal of 211220314221 is 122413022112.

It is a happy number.

It is not a de Polignac number, because 211220314221 - 2⁶ = 211220314157 is a prime.

It is a super-2 number, since 2×211220314221² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220312221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122659020 + ... + 122660741.

It is an arithmetic number, because the mean of its divisors is an integer number (20606860008).

Almost surely, 2^211220314221 is an apocalyptic number.

211220314221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211220314221 is a deficient number, since it is larger than the sum of its proper divisors (118489445907).

211220314221 is a wasteful number, since it uses less digits than its factorization.

211220314221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245319812.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 211220314221 its reverse (122413022112), we get a palindrome (333633336333).

The spelling of 211220314221 in words is "two hundred eleven billion, two hundred twenty million, three hundred fourteen thousand, two hundred twenty-one".