1221162511470 has 256 divisors, whose sum is σ = 3568321797120. Its totient is φ = 263601561600.

The previous prime is 1221162511433. The next prime is 1221162511549. The reversal of 1221162511470 is 741152611221.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 82386660 + ... + 82401480.

It is an arithmetic number, because the mean of its divisors is an integer number (13938757020).

Almost surely, 2^{1221162511470} is an apocalyptic number.

1221162511470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221162511470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1784160898560).

1221162511470 is an abundant number, since it is smaller than the sum of its proper divisors (2347159285650).

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

1221162511470 is a wasteful number, since it uses less digits than its factorization.

1221162511470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15651.

The product of its (nonzero) digits is 6720, while the sum is 33.

The spelling of 1221162511470 in words is "one trillion, two hundred twenty-one billion, one hundred sixty-two million, five hundred eleven thousand, four hundred seventy".