210002121001221 has 8 divisors (see below), whose sum is σ = 287570472001824. Its totient is φ = 136217592000720.

The previous prime is 210002121001213. The next prime is 210002121001223. The reversal of 210002121001221 is 122100121200012.

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

It is not a de Polignac number, because 210002121001221 - 2³ = 210002121001213 is a prime.

It is a super-2 number, since 2×210002121001221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210002121001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210002121001223) 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, 945955499895 + ... + 945955500116.

It is an arithmetic number, because the mean of its divisors is an integer number (35946309000228).

Almost surely, 2^{210002121001221} is an apocalyptic number.

It is an amenable number.

210002121001221 is a deficient number, since it is larger than the sum of its proper divisors (77568351000603).

210002121001221 is a wasteful number, since it uses less digits than its factorization.

210002121001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891911000051.

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

Adding to 210002121001221 its reverse (122100121200012), we get a palindrome (332102242201233).

The spelling of 210002121001221 in words is "two hundred ten trillion, two billion, one hundred twenty-one million, one thousand, two hundred twenty-one".