2505629421 has 6 divisors (see below), whose sum is σ = 3619242510. Its totient is φ = 1670419608.

The previous prime is 2505629419. The next prime is 2505629447. The reversal of 2505629421 is 1249265052.

2505629421 is a `hidden beast` number, since 2 + 5 + 0 + 5 + 629 + 4 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1559144196 + 946485225 = 39486^2 + 30765^2 .

It is not a de Polignac number, because 2505629421 - 2¹ = 2505629419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505629461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139201626 + ... + 139201643.

It is an arithmetic number, because the mean of its divisors is an integer number (603207085).

Almost surely, 2^2505629421 is an apocalyptic number.

It is an amenable number.

2505629421 is a deficient number, since it is larger than the sum of its proper divisors (1113613089).

2505629421 is a wasteful number, since it uses less digits than its factorization.

2505629421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278403275 (or 278403272 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 2505629421 is about 50056.2625552488. The cubic root of 2505629421 is about 1358.2267512577.

The spelling of 2505629421 in words is "two billion, five hundred five million, six hundred twenty-nine thousand, four hundred twenty-one".