2532400021 has 2 divisors, whose sum is σ = 2532400022. Its totient is φ = 2532400020.

The previous prime is 2532399979. The next prime is 2532400051. The reversal of 2532400021 is 1200042352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1476864900 + 1055535121 = 38430^2 + 32489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2532400021 - 2⁷ = 2532399893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2532400051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1266200010 + 1266200011.

It is an arithmetic number, because the mean of its divisors is an integer number (1266200011).

Almost surely, 2^2532400021 is an apocalyptic number.

It is an amenable number.

2532400021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2532400021 is an equidigital number, since it uses as much as digits as its factorization.

2532400021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 2532400021 is about 50322.9571964923. The cubic root of 2532400021 is about 1363.0468061497.

Adding to 2532400021 its reverse (1200042352), we get a palindrome (3732442373).

The spelling of 2532400021 in words is "two billion, five hundred thirty-two million, four hundred thousand, twenty-one".