21252053235 has 32 divisors (see below), whose sum is σ = 39297553920. Its totient is φ = 9606060288.

The previous prime is 21252053233. The next prime is 21252053237. The reversal of 21252053235 is 53235025212.

It is an interprime number because it is at equal distance from previous prime (21252053233) and next prime (21252053237).

It is not a de Polignac number, because 21252053235 - 2¹ = 21252053233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21252053233) 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 31 ways as a sum of consecutive naturals, for example, 1127737 + ... + 1146426.

It is an arithmetic number, because the mean of its divisors is an integer number (1228048560).

Almost surely, 2^21252053235 is an apocalyptic number.

21252053235 is a deficient number, since it is larger than the sum of its proper divisors (18045500685).

21252053235 is a wasteful number, since it uses less digits than its factorization.

21252053235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2274267.

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 21252053235 its reverse (53235025212), we get a palindrome (74487078447).

The spelling of 21252053235 in words is "twenty-one billion, two hundred fifty-two million, fifty-three thousand, two hundred thirty-five".