210102120021 has 16 divisors (see below), whose sum is σ = 282226261824. Its totient is φ = 139026824064.

The previous prime is 210102120001. The next prime is 210102120037. The reversal of 210102120021 is 120021201012.

It is not a de Polignac number, because 210102120021 - 2¹⁸ = 210101857877 is a prime.

It is a super-3 number, since 3×210102120021³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210102119979 and 210102120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210102120001) 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, 252511 + ... + 695676.

It is an arithmetic number, because the mean of its divisors is an integer number (17639141364).

Almost surely, 2^210102120021 is an apocalyptic number.

It is an amenable number.

210102120021 is a deficient number, since it is larger than the sum of its proper divisors (72124141803).

210102120021 is a wasteful number, since it uses less digits than its factorization.

210102120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948740.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210102120021 its reverse (120021201012), we get a palindrome (330123321033).

The spelling of 210102120021 in words is "two hundred ten billion, one hundred two million, one hundred twenty thousand, twenty-one".