210121110120021 has 8 divisors (see below), whose sum is σ = 280538548104000. Its totient is φ = 139892206108032.

The previous prime is 210121110119983. The next prime is 210121110120073. The reversal of 210121110120021 is 120021011121012.

It is a happy number.

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

It is not a de Polignac number, because 210121110120021 - 2²³ = 210121101731413 is a prime.

It is a super-3 number, since 3×210121110120021³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121110120091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47133490396 + ... + 47133494853.

It is an arithmetic number, because the mean of its divisors is an integer number (35067318513000).

Almost surely, 2^{210121110120021} is an apocalyptic number.

It is an amenable number.

210121110120021 is a deficient number, since it is larger than the sum of its proper divisors (70417437983979).

210121110120021 is an equidigital number, since it uses as much as digits as its factorization.

210121110120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94266985995.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 210121110120021 its reverse (120021011121012), we get a palindrome (330142121241033).

The spelling of 210121110120021 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred ten million, one hundred twenty thousand, twenty-one".