121221012021210 has 24 divisors (see below), whose sum is σ = 315174631255380. Its totient is φ = 32325603205632.

The previous prime is 121221012021191. The next prime is 121221012021227. The reversal of 121221012021210 is 12120210122121.

121221012021210 is a `hidden beast` number, since 1 + 212 + 210 + 1 + 20 + 212 + 10 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 111042889460721 + 10178122560489 = 10537689^2 + 3190317^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 673450066695 + ... + 673450066874.

Almost surely, 2^{121221012021210} is an apocalyptic number.

121221012021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221012021210 is an abundant number, since it is smaller than the sum of its proper divisors (193953619234170).

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

121221012021210 is a wasteful number, since it uses less digits than its factorization.

121221012021210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346900133582 (or 1346900133579 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121221012021210 its reverse (12120210122121), we get a palindrome (133341222143331).

The spelling of 121221012021210 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twelve million, twenty-one thousand, two hundred ten".