4072500121 has 2 divisors, whose sum is σ = 4072500122. Its totient is φ = 4072500120.

The previous prime is 4072500067. The next prime is 4072500139. The reversal of 4072500121 is 1210052704.

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., 2378025225 + 1694474896 = 48765^2 + 41164^2 .

It is a cyclic number.

It is not a de Polignac number, because 4072500121 - 2²¹ = 4070402969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4072500092 and 4072500101.

It is not a weakly prime, because it can be changed into another prime (4072500151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2036250060 + 2036250061.

It is an arithmetic number, because the mean of its divisors is an integer number (2036250061).

Almost surely, 2^4072500121 is an apocalyptic number.

It is an amenable number.

4072500121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4072500121 is an equidigital number, since it uses as much as digits as its factorization.

4072500121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 4072500121 is about 63816.1431065839. The cubic root of 4072500121 is about 1596.9342494071.

Adding to 4072500121 its reverse (1210052704), we get a palindrome (5282552825).

The spelling of 4072500121 in words is "four billion, seventy-two million, five hundred thousand, one hundred twenty-one".