1221211231002 has 48 divisors (see below), whose sum is σ = 3105680053632. Its totient is φ = 339487290720.

The previous prime is 1221211231001. The next prime is 1221211231013. The reversal of 1221211231002 is 2001321121221.

1221211231002 is a `hidden beast` number, since 1 + 221 + 211 + 231 + 0 + 0 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1221211231001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130970374 + ... + 130979697.

It is an arithmetic number, because the mean of its divisors is an integer number (64701667784).

Almost surely, 2^{1221211231002} is an apocalyptic number.

1221211231002 is an abundant number, since it is smaller than the sum of its proper divisors (1884468822630).

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

1221211231002 is a wasteful number, since it uses less digits than its factorization.

1221211231002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261950123 (or 261950120 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1221211231002 its reverse (2001321121221), we get a palindrome (3222532352223).

The spelling of 1221211231002 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred thirty-one thousand, two".