211220221304 has 8 divisors (see below), whose sum is σ = 396037914960. Its totient is φ = 105610110648.

The previous prime is 211220221301. The next prime is 211220221327. The reversal of 211220221304 is 403122022112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×211220221304² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220221301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13201263824 + ... + 13201263839.

It is an arithmetic number, because the mean of its divisors is an integer number (49504739370).

Almost surely, 2^211220221304 is an apocalyptic number.

It is an amenable number.

211220221304 is a deficient number, since it is larger than the sum of its proper divisors (184817693656).

211220221304 is a wasteful number, since it uses less digits than its factorization.

211220221304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26402527669 (or 26402527665 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 211220221304 its reverse (403122022112), we get a palindrome (614342243416).

The spelling of 211220221304 in words is "two hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, three hundred four".