6401060021 has 2 divisors, whose sum is σ = 6401060022. Its totient is φ = 6401060020.

The previous prime is 6401060009. The next prime is 6401060033. The reversal of 6401060021 is 1200601046.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (6401060009) and next prime (6401060033).

It can be written as a sum of positive squares in only one way, i.e., 5687422225 + 713637796 = 75415^2 + 26714^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401060021 - 2⁶ = 6401059957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6401059975 and 6401060002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6401060221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200530010 + 3200530011.

It is an arithmetic number, because the mean of its divisors is an integer number (3200530011).

Almost surely, 2^6401060021 is an apocalyptic number.

It is an amenable number.

6401060021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401060021 is an equidigital number, since it uses as much as digits as its factorization.

6401060021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 6401060021 is about 80006.6248569454. The cubic root of 6401060021 is about 1856.7380315706.

Adding to 6401060021 its reverse (1200601046), we get a palindrome (7601661067).

The spelling of 6401060021 in words is "six billion, four hundred one million, sixty thousand, twenty-one".