212221501 has 8 divisors (see below), whose sum is σ = 215957408. Its totient is φ = 208494000.

The previous prime is 212221463. The next prime is 212221519. The reversal of 212221501 is 105122212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 212221501 - 2⁹ = 212220989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221531) 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, 69946 + ... + 72916.

It is an arithmetic number, because the mean of its divisors is an integer number (26994676).

Almost surely, 2^212221501 is an apocalyptic number.

It is an amenable number.

212221501 is a deficient number, since it is larger than the sum of its proper divisors (3735907).

212221501 is a wasteful number, since it uses less digits than its factorization.

212221501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 212221501 is about 14567.8241683513. The cubic root of 212221501 is about 596.4807887583.

Adding to 212221501 its reverse (105122212), we get a palindrome (317343713).

The spelling of 212221501 in words is "two hundred twelve million, two hundred twenty-one thousand, five hundred one".