1221989040526 has 8 divisors (see below), whose sum is σ = 1833012365184. Its totient is φ = 610984918800.

The previous prime is 1221989040511. The next prime is 1221989040529. The reversal of 1221989040526 is 6250409891221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221989040526.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221989040529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4640575 + ... + 4896826.

It is an arithmetic number, because the mean of its divisors is an integer number (229126545648).

Almost surely, 2^{1221989040526} is an apocalyptic number.

1221989040526 is a deficient number, since it is larger than the sum of its proper divisors (611023324658).

1221989040526 is an equidigital number, since it uses as much as digits as its factorization.

1221989040526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9601466.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 1221989040526 in words is "one trillion, two hundred twenty-one billion, nine hundred eighty-nine million, forty thousand, five hundred twenty-six".