210121103021 has 4 divisors (see below), whose sum is σ = 210245216412. Its totient is φ = 209996989632.

The previous prime is 210121103009. The next prime is 210121103053. The reversal of 210121103021 is 120301121012.

210121103021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152045404900 + 58075698121 = 389930^2 + 240989^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121103021 - 2⁶ = 210121102957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210121102987 and 210121103005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121103081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62054156 + ... + 62057541.

It is an arithmetic number, because the mean of its divisors is an integer number (52561304103).

Almost surely, 2^210121103021 is an apocalyptic number.

It is an amenable number.

210121103021 is a deficient number, since it is larger than the sum of its proper divisors (124113391).

210121103021 is a wasteful number, since it uses less digits than its factorization.

210121103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124113390.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 210121103021 its reverse (120301121012), we get a palindrome (330422224033).

The spelling of 210121103021 in words is "two hundred ten billion, one hundred twenty-one million, one hundred three thousand, twenty-one".