1221070337429 has 4 divisors (see below), whose sum is σ = 1224693691884. Its totient is φ = 1217446982976.

The previous prime is 1221070337381. The next prime is 1221070337449. The reversal of 1221070337429 is 9247330701221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 924261118225 + 296809219204 = 961385^2 + 544802^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221070337429 - 2¹⁶ = 1221070271893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221070337449) 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, 1811676722 + ... + 1811677395.

It is an arithmetic number, because the mean of its divisors is an integer number (306173422971).

Almost surely, 2^{1221070337429} is an apocalyptic number.

It is an amenable number.

1221070337429 is a deficient number, since it is larger than the sum of its proper divisors (3623354455).

1221070337429 is an equidigital number, since it uses as much as digits as its factorization.

1221070337429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3623354454.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 1221070337429 in words is "one trillion, two hundred twenty-one billion, seventy million, three hundred thirty-seven thousand, four hundred twenty-nine".