211221453 has 8 divisors (see below), whose sum is σ = 285832288. Its totient is φ = 138712464.

The previous prime is 211221421. The next prime is 211221469. The reversal of 211221453 is 354122112.

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

It is not a de Polignac number, because 211221453 - 2⁵ = 211221421 is a prime.

It is a super-2 number, since 2×211221453² = 89229004414862418, which 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 (211221473) 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, 525226 + ... + 525627.

It is an arithmetic number, because the mean of its divisors is an integer number (35729036).

Almost surely, 2^211221453 is an apocalyptic number.

It is an amenable number.

211221453 is a deficient number, since it is larger than the sum of its proper divisors (74610835).

211221453 is a wasteful number, since it uses less digits than its factorization.

211221453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050923.

The product of its digits is 480, while the sum is 21.

The square root of 211221453 is about 14533.4597739148. The cubic root of 211221453 is about 595.5423842271.

Adding to 211221453 its reverse (354122112), we get a palindrome (565343565).

The spelling of 211221453 in words is "two hundred eleven million, two hundred twenty-one thousand, four hundred fifty-three".