21225114052 has 12 divisors (see below), whose sum is σ = 37173045420. Its totient is φ = 10604243936.

The previous prime is 21225114017. The next prime is 21225114083. The reversal of 21225114052 is 25041152212.

It can be written as a sum of positive squares in 2 ways, for example, as 9460674756 + 11764439296 = 97266^2 + 108464^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2072527 + ... + 2082742.

It is an arithmetic number, because the mean of its divisors is an integer number (3097753785).

Almost surely, 2^21225114052 is an apocalyptic number.

It is an amenable number.

21225114052 is a deficient number, since it is larger than the sum of its proper divisors (15947931368).

21225114052 is a wasteful number, since it uses less digits than its factorization.

21225114052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156550 (or 4156548 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21225114052 its reverse (25041152212), we get a palindrome (46266266264).

The spelling of 21225114052 in words is "twenty-one billion, two hundred twenty-five million, one hundred fourteen thousand, fifty-two".