21233500245 has 32 divisors (see below), whose sum is σ = 38768682240. Its totient is φ = 11018462400.

The previous prime is 21233500243. The next prime is 21233500349. The reversal of 21233500245 is 54200533212.

It is a happy number.

It is not a de Polignac number, because 21233500245 - 2¹ = 21233500243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233500241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2120481 + ... + 2130470.

It is an arithmetic number, because the mean of its divisors is an integer number (1211521320).

Almost surely, 2^21233500245 is an apocalyptic number.

It is an amenable number.

21233500245 is a deficient number, since it is larger than the sum of its proper divisors (17535181995).

21233500245 is a wasteful number, since it uses less digits than its factorization.

21233500245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4251002 (or 4250996 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 21233500245 in words is "twenty-one billion, two hundred thirty-three million, five hundred thousand, two hundred forty-five".