1421121202309 has 4 divisors (see below), whose sum is σ = 1421169273580. Its totient is φ = 1421073131040.

The previous prime is 1421121202283. The next prime is 1421121202379. The reversal of 1421121202309 is 9032021211241.

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 1000670112225 + 420451090084 = 1000335^2 + 648422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421121202309 - 2¹⁵ = 1421121169541 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 (1421121202379) 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, 23991264 + ... + 24050425.

It is an arithmetic number, because the mean of its divisors is an integer number (355292318395).

Almost surely, 2^{1421121202309} is an apocalyptic number.

It is an amenable number.

1421121202309 is a deficient number, since it is larger than the sum of its proper divisors (48071271).

1421121202309 is an equidigital number, since it uses as much as digits as its factorization.

1421121202309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48071270.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 1421121202309 in words is "one trillion, four hundred twenty-one billion, one hundred twenty-one million, two hundred two thousand, three hundred nine".