210552101221 has 16 divisors (see below), whose sum is σ = 262687569408. Its totient is φ = 163953414000.

The previous prime is 210552101219. The next prime is 210552101231. The reversal of 210552101221 is 122101255012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 210552101221 - 2¹ = 210552101219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210552101192 and 210552101201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210552101231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 830535 + ... + 1053988.

It is an arithmetic number, because the mean of its divisors is an integer number (16417973088).

Almost surely, 2^210552101221 is an apocalyptic number.

It is an amenable number.

210552101221 is a deficient number, since it is larger than the sum of its proper divisors (52135468187).

210552101221 is a wasteful number, since it uses less digits than its factorization.

210552101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885992.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 210552101221 its reverse (122101255012), we get a palindrome (332653356233).

The spelling of 210552101221 in words is "two hundred ten billion, five hundred fifty-two million, one hundred one thousand, two hundred twenty-one".