1720062121 has 2 divisors, whose sum is σ = 1720062122. Its totient is φ = 1720062120.

The previous prime is 1720062101. The next prime is 1720062137. The reversal of 1720062121 is 1212600271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1698346521 + 21715600 = 41211^2 + 4660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720062121 - 2¹¹ = 1720060073 is a prime.

It is a super-2 number, since 2×1720062121² = 5917227400198037282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1720062092 and 1720062101.

It is not a weakly prime, because it can be changed into another prime (1720062101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860031060 + 860031061.

It is an arithmetic number, because the mean of its divisors is an integer number (860031061).

Almost surely, 2^1720062121 is an apocalyptic number.

It is an amenable number.

1720062121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720062121 is an equidigital number, since it uses as much as digits as its factorization.

1720062121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1720062121 is about 41473.6316350522. The cubic root of 1720062121 is about 1198.1597072207.

Adding to 1720062121 its reverse (1212600271), we get a palindrome (2932662392).

The spelling of 1720062121 in words is "one billion, seven hundred twenty million, sixty-two thousand, one hundred twenty-one".