245132220521 has 2 divisors, whose sum is σ = 245132220522. Its totient is φ = 245132220520.

The previous prime is 245132220493. The next prime is 245132220533. The reversal of 245132220521 is 125022231542.

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., 208085594896 + 37046625625 = 456164^2 + 192475^2 .

It is a cyclic number.

It is not a de Polignac number, because 245132220521 - 2⁶ = 245132220457 is a prime.

It is a super-2 number, since 2×245132220521² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (245132220581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122566110260 + 122566110261.

It is an arithmetic number, because the mean of its divisors is an integer number (122566110261).

Almost surely, 2^245132220521 is an apocalyptic number.

It is an amenable number.

245132220521 is a deficient number, since it is larger than the sum of its proper divisors (1).

245132220521 is an equidigital number, since it uses as much as digits as its factorization.

245132220521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 245132220521 in words is "two hundred forty-five billion, one hundred thirty-two million, two hundred twenty thousand, five hundred twenty-one".