121010100210 has 24 divisors (see below), whose sum is σ = 314626260780. Its totient is φ = 32269360032.

The previous prime is 121010100199. The next prime is 121010100223. The reversal of 121010100210 is 12001010121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 101622601089 + 19387499121 = 318783^2 + 139239^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121010100192 and 121010100201.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 672278245 + ... + 672278424.

Almost surely, 2^121010100210 is an apocalyptic number.

121010100210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121010100210 is an abundant number, since it is smaller than the sum of its proper divisors (193616160570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121010100210 is a wasteful number, since it uses less digits than its factorization.

121010100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344556682 (or 1344556679 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121010100210 its reverse (12001010121), we get a palindrome (133011110331).

The spelling of 121010100210 in words is "one hundred twenty-one billion, ten million, one hundred thousand, two hundred ten".