201211621 has 8 divisors (see below), whose sum is σ = 216859104. Its totient is φ = 185588400.

The previous prime is 201211603. The next prime is 201211627. The reversal of 201211621 is 126112102.

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 201211621 - 2⁵ = 201211589 is a prime.

It is a super-2 number, since 2×201211621² = 80972232850895282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201211595 and 201211604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211627) 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, 13530 + ... + 24196.

It is an arithmetic number, because the mean of its divisors is an integer number (27107388).

Almost surely, 2^201211621 is an apocalyptic number.

It is an amenable number.

201211621 is a deficient number, since it is larger than the sum of its proper divisors (15647483).

201211621 is a wasteful number, since it uses less digits than its factorization.

201211621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12131.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 201211621 is about 14184.9082126040. The cubic root of 201211621 is about 585.9821046615.

Adding to 201211621 its reverse (126112102), we get a palindrome (327323723).

The spelling of 201211621 in words is "two hundred one million, two hundred eleven thousand, six hundred twenty-one".