655022421 has 12 divisors (see below), whose sum is σ = 947377548. Its totient is φ = 436112064.

The previous prime is 655022419. The next prime is 655022443. The reversal of 655022421 is 124220556.

655022421 is a `hidden beast` number, since 655 + 0 + 2 + 2 + 4 + 2 + 1 = 666.

655022421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 133402500 + 521619921 = 11550^2 + 22839^2 .

It is not a de Polignac number, because 655022421 - 2¹ = 655022419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655022411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40120 + ... + 54033.

It is an arithmetic number, because the mean of its divisors is an integer number (78948129).

Almost surely, 2^655022421 is an apocalyptic number.

It is an amenable number.

655022421 is a deficient number, since it is larger than the sum of its proper divisors (292355127).

655022421 is a wasteful number, since it uses less digits than its factorization.

655022421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94932 (or 94929 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 655022421 is about 25593.4058108725. The cubic root of 655022421 is about 868.4644693799.

Adding to 655022421 its reverse (124220556), we get a palindrome (779242977).

The spelling of 655022421 in words is "six hundred fifty-five million, twenty-two thousand, four hundred twenty-one".