1220213155131 has 12 divisors (see below), whose sum is σ = 1763720226840. Its totient is φ = 812926153440.

The previous prime is 1220213155127. The next prime is 1220213155207. The reversal of 1220213155131 is 1315513120221.

1220213155131 is a `hidden beast` number, since 12 + 2 + 0 + 2 + 131 + 5 + 513 + 1 = 666.

It is not a de Polignac number, because 1220213155131 - 2² = 1220213155127 is a prime.

It is a super-2 number, since 2×1220213155131² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220213155095 and 1220213155104.

It is not an unprimeable number, because it can be changed into a prime (1220213150131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45759541 + ... + 45786198.

It is an arithmetic number, because the mean of its divisors is an integer number (146976685570).

Almost surely, 2^{1220213155131} is an apocalyptic number.

1220213155131 is a deficient number, since it is larger than the sum of its proper divisors (543507071709).

1220213155131 is a wasteful number, since it uses less digits than its factorization.

1220213155131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91547226 (or 91547223 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 1220213155131 its reverse (1315513120221), we get a palindrome (2535726275352).

The spelling of 1220213155131 in words is "one trillion, two hundred twenty billion, two hundred thirteen million, one hundred fifty-five thousand, one hundred thirty-one".