210121110021010 has 8 divisors (see below), whose sum is σ = 378217998037836. Its totient is φ = 84048444008400.

The previous prime is 210121110020989. The next prime is 210121110021013. The reversal of 210121110021010 is 10120011121012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 203908718274921 + 6212391746089 = 14279661^2 + 2492467^2 .

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

It is a super-2 number, since 2×210121110021010² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (210121110021013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10506055501041 + ... + 10506055501060.

Almost surely, 2^{210121110021010} is an apocalyptic number.

210121110021010 is a deficient number, since it is larger than the sum of its proper divisors (168096888016826).

210121110021010 is a wasteful number, since it uses less digits than its factorization.

210121110021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21012111002108.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 210121110021010 its reverse (10120011121012), we get a palindrome (220241121142022).

The spelling of 210121110021010 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred ten million, twenty-one thousand, ten".