1221212210131 has 8 divisors (see below), whose sum is σ = 1290488435280. Its totient is φ = 1152436174848.

The previous prime is 1221212210077. The next prime is 1221212210149. The reversal of 1221212210131 is 1310122121221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221212210131 - 2⁷ = 1221212210003 is a prime.

It is a super-2 number, since 2×1221212210131² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221212210099 and 1221212210108.

It is not an unprimeable number, because it can be changed into a prime (1221212210161) 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, 125042446 + ... + 125052211.

It is an arithmetic number, because the mean of its divisors is an integer number (161311054410).

Almost surely, 2^{1221212210131} is an apocalyptic number.

1221212210131 is a deficient number, since it is larger than the sum of its proper divisors (69276225149).

1221212210131 is a wasteful number, since it uses less digits than its factorization.

1221212210131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250094933.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1221212210131 its reverse (1310122121221), we get a palindrome (2531334331352).

The spelling of 1221212210131 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, one hundred thirty-one".