1351221005660 has 24 divisors (see below), whose sum is σ = 2838173619120. Its totient is φ = 540372305664.

The previous prime is 1351221005633. The next prime is 1351221005669. The reversal of 1351221005660 is 665001221531.

It is a super-2 number, since 2×1351221005660² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351221005669) 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, 7160570 + ... + 7346849.

It is an arithmetic number, because the mean of its divisors is an integer number (118257234130).

Almost surely, 2^{1351221005660} is an apocalyptic number.

1351221005660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1351221005660 is an abundant number, since it is smaller than the sum of its proper divisors (1486952613460).

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

1351221005660 is a wasteful number, since it uses less digits than its factorization.

1351221005660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14512085 (or 14512083 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 1351221005660 in words is "one trillion, three hundred fifty-one billion, two hundred twenty-one million, five thousand, six hundred sixty".