1221001230132 has 72 divisors (see below), whose sum is σ = 3116116883880. Its totient is φ = 403087622400.

The previous prime is 1221001230131. The next prime is 1221001230133. The reversal of 1221001230132 is 2310321001221.

It is an interprime number because it is at equal distance from previous prime (1221001230131) and next prime (1221001230133).

It can be written as a sum of positive squares in 4 ways, for example, as 51891017616 + 1169110212516 = 227796^2 + 1081254^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221001230131) 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, 8929882 + ... + 9065582.

It is an arithmetic number, because the mean of its divisors is an integer number (43279401165).

Almost surely, 2^{1221001230132} is an apocalyptic number.

1221001230132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221001230132 is an abundant number, since it is smaller than the sum of its proper divisors (1895115653748).

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

1221001230132 is a wasteful number, since it uses less digits than its factorization.

1221001230132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138113 (or 138108 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1221001230132 its reverse (2310321001221), we get a palindrome (3531322231353).

The spelling of 1221001230132 in words is "one trillion, two hundred twenty-one billion, one million, two hundred thirty thousand, one hundred thirty-two".