211221453612 has 48 divisors (see below), whose sum is σ = 531022705920. Its totient is φ = 64959244608.

The previous prime is 211221453517. The next prime is 211221453631. The reversal of 211221453612 is 216354122112.

It is a super-2 number, since 2×211221453612² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221453612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13938 + ... + 650105.

It is an arithmetic number, because the mean of its divisors is an integer number (11062973040).

Almost surely, 2^211221453612 is an apocalyptic number.

It is an amenable number.

211221453612 is an abundant number, since it is smaller than the sum of its proper divisors (319801252308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221453612 is a wasteful number, since it uses less digits than its factorization.

211221453612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666102 (or 666100 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

Adding to 211221453612 its reverse (216354122112), we get a palindrome (427575575724).

The spelling of 211221453612 in words is "two hundred eleven billion, two hundred twenty-one million, four hundred fifty-three thousand, six hundred twelve".