210121211001010 has 16 divisors (see below), whose sum is σ = 384418477832472. Its totient is φ = 82670640393600.

The previous prime is 210121211000989. The next prime is 210121211001011. The reversal of 210121211001010 is 10100112121012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 180945300431281 + 29175910569729 = 13451591^2 + 5401473^2 .

It is not an unprimeable number, because it can be changed into a prime (210121211001011) 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, 172230500211 + ... + 172230501430.

Almost surely, 2^{210121211001010} is an apocalyptic number.

210121211001010 is a deficient number, since it is larger than the sum of its proper divisors (174297266831462).

210121211001010 is a wasteful number, since it uses less digits than its factorization.

210121211001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344461001709.

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

Adding to 210121211001010 its reverse (10100112121012), we get a palindrome (220221323122022).

The spelling of 210121211001010 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred eleven million, one thousand, ten".