20122051409 has 2 divisors, whose sum is σ = 20122051410. Its totient is φ = 20122051408.

The previous prime is 20122051373. The next prime is 20122051489. The reversal of 20122051409 is 90415022102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17575335184 + 2546716225 = 132572^2 + 50465^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122051409 - 2¹² = 20122047313 is a prime.

It is not a weakly prime, because it can be changed into another prime (20122051489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061025704 + 10061025705.

It is an arithmetic number, because the mean of its divisors is an integer number (10061025705).

Almost surely, 2^20122051409 is an apocalyptic number.

It is an amenable number.

20122051409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122051409 is an equidigital number, since it uses as much as digits as its factorization.

20122051409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 20122051409 in words is "twenty billion, one hundred twenty-two million, fifty-one thousand, four hundred nine".