210021201012121 has 8 divisors (see below), whose sum is σ = 210035377728360. Its totient is φ = 210007024816128.

The previous prime is 210021201012101. The next prime is 210021201012137. The reversal of 210021201012121 is 121210102120012.

It can be written as a sum of positive squares in 4 ways, for example, as 63808703161225 + 146212497850896 = 7988035^2 + 12091836^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 210021201012121 - 2¹⁵ = 210021200979353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021201012095 and 210021201012104.

It is not an unprimeable number, because it can be changed into a prime (210021201012101) 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, 1093895485 + ... + 1094087461.

It is an arithmetic number, because the mean of its divisors is an integer number (26254422216045).

Almost surely, 2^{210021201012121} is an apocalyptic number.

It is an amenable number.

210021201012121 is a deficient number, since it is larger than the sum of its proper divisors (14176716239).

210021201012121 is a wasteful number, since it uses less digits than its factorization.

210021201012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260123.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210021201012121 its reverse (121210102120012), we get a palindrome (331231303132133).

The spelling of 210021201012121 in words is "two hundred ten trillion, twenty-one billion, two hundred one million, twelve thousand, one hundred twenty-one".