145202542421 has 2 divisors, whose sum is σ = 145202542422. Its totient is φ = 145202542420.

The previous prime is 145202542417. The next prime is 145202542451. The reversal of 145202542421 is 124245202541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85241225521 + 59961316900 = 291961^2 + 244870^2 .

It is a cyclic number.

It is not a de Polignac number, because 145202542421 - 2² = 145202542417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145202542451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72601271210 + 72601271211.

It is an arithmetic number, because the mean of its divisors is an integer number (72601271211).

Almost surely, 2^145202542421 is an apocalyptic number.

It is an amenable number.

145202542421 is a deficient number, since it is larger than the sum of its proper divisors (1).

145202542421 is an equidigital number, since it uses as much as digits as its factorization.

145202542421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25600, while the sum is 32.

Adding to 145202542421 its reverse (124245202541), we get a palindrome (269447744962).

The spelling of 145202542421 in words is "one hundred forty-five billion, two hundred two million, five hundred forty-two thousand, four hundred twenty-one".