1221132531040 has 96 divisors (see below), whose sum is σ = 2967952536864. Its totient is φ = 474440601600.

The previous prime is 1221132530993. The next prime is 1221132531139. The reversal of 1221132531040 is 401352311221.

It is a junction number, because it is equal to n+sod(n) for n = 1221132530996 and 1221132531014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3299340 + ... + 3650740.

It is an arithmetic number, because the mean of its divisors is an integer number (30916172259).

Almost surely, 2^{1221132531040} is an apocalyptic number.

1221132531040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221132531040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1483976268432).

1221132531040 is an abundant number, since it is smaller than the sum of its proper divisors (1746820005824).

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

1221132531040 is a wasteful number, since it uses less digits than its factorization.

1221132531040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352040 (or 352032 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 1221132531040 its reverse (401352311221), we get a palindrome (1622484842261).

The spelling of 1221132531040 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-two million, five hundred thirty-one thousand, forty".