1210221331209 has 40 divisors (see below), whose sum is σ = 1974868011072. Its totient is φ = 732479902560.

The previous prime is 1210221331201. The next prime is 1210221331219. The reversal of 1210221331209 is 9021331220121.

1210221331209 is a `hidden beast` number, since 1 + 2 + 102 + 21 + 331 + 209 = 666.

It is not a de Polignac number, because 1210221331209 - 2³ = 1210221331201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1210221331201) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 252034 + ... + 1576059.

Almost surely, 2^{1210221331209} is an apocalyptic number.

It is an amenable number.

1210221331209 is a deficient number, since it is larger than the sum of its proper divisors (764646679863).

1210221331209 is a wasteful number, since it uses less digits than its factorization.

1210221331209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828859 (or 1828850 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

It can be divided in two parts, 12102 and 21331209, that added together give a triangular number (21343311 = T₆₅₃₃).

The spelling of 1210221331209 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, three hundred thirty-one thousand, two hundred nine".