210002121 has 48 divisors (see below), whose sum is σ = 371614464. Its totient is φ = 111652992.

The previous prime is 210002119. The next prime is 210002141. The reversal of 210002121 is 121200012.

It is not a de Polignac number, because 210002121 - 2¹ = 210002119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (210002141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51655 + ... + 55571.

It is an arithmetic number, because the mean of its divisors is an integer number (7741968).

Almost surely, 2^210002121 is an apocalyptic number.

210002121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210002121 is a deficient number, since it is larger than the sum of its proper divisors (161612343).

210002121 is a wasteful number, since it uses less digits than its factorization.

210002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990 (or 3987 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 210002121 is about 14491.4499274572. The cubic root of 210002121 is about 594.3941963900.

Adding to 210002121 its reverse (121200012), we get a palindrome (331202133).

The spelling of 210002121 in words is "two hundred ten million, two thousand, one hundred twenty-one".