1221060165510 has 32 divisors (see below), whose sum is σ = 2931041272320. Its totient is φ = 325560835808.

The previous prime is 1221060165449. The next prime is 1221060165517. The reversal of 1221060165510 is 155610601221.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221060165517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3270480 + ... + 3624659.

It is an arithmetic number, because the mean of its divisors is an integer number (91595039760).

Almost surely, 2^{1221060165510} is an apocalyptic number.

1221060165510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221060165510 is an abundant number, since it is smaller than the sum of its proper divisors (1709981106810).

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

1221060165510 is a wasteful number, since it uses less digits than its factorization.

1221060165510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6901052.

The product of its (nonzero) digits is 3600, while the sum is 30.

Adding to 1221060165510 its reverse (155610601221), we get a palindrome (1376670766731).

The spelling of 1221060165510 in words is "one trillion, two hundred twenty-one billion, sixty million, one hundred sixty-five thousand, five hundred ten".