210102001021 has 32 divisors (see below), whose sum is σ = 236970302976. Its totient is φ = 184624440000.

The previous prime is 210102001003. The next prime is 210102001033. The reversal of 210102001021 is 120100201012.

It is not a de Polignac number, because 210102001021 - 2⁹ = 210102000509 is a prime.

It is a super-3 number, since 3×210102001021³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210102000989 and 210102001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210102001061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73435131 + ... + 73437991.

It is an arithmetic number, because the mean of its divisors is an integer number (7405321968).

Almost surely, 2^210102001021 is an apocalyptic number.

It is an amenable number.

210102001021 is a deficient number, since it is larger than the sum of its proper divisors (26868301955).

210102001021 is a wasteful number, since it uses less digits than its factorization.

210102001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210102001021 its reverse (120100201012), we get a palindrome (330202202033).

Subtracting from 210102001021 its reverse (120100201012), we obtain a square (90001800009 = 300003²).

The spelling of 210102001021 in words is "two hundred ten billion, one hundred two million, one thousand, twenty-one".