201021210001221 has 8 divisors (see below), whose sum is σ = 268438736788320. Its totient is φ = 133808911607472.

The previous prime is 201021210001201. The next prime is 201021210001243. The reversal of 201021210001221 is 122100012120102.

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

It is not a de Polignac number, because 201021210001221 - 2⁵ = 201021210001189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201021210001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021210001201) 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, 51307096051 + ... + 51307099968.

It is an arithmetic number, because the mean of its divisors is an integer number (33554842098540).

Almost surely, 2^{201021210001221} is an apocalyptic number.

It is an amenable number.

201021210001221 is a deficient number, since it is larger than the sum of its proper divisors (67417526787099).

201021210001221 is a wasteful number, since it uses less digits than its factorization.

201021210001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102614196675.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201021210001221 its reverse (122100012120102), we get a palindrome (323121222121323).

The spelling of 201021210001221 in words is "two hundred one trillion, twenty-one billion, two hundred ten million, one thousand, two hundred twenty-one".