21245254005 has 16 divisors (see below), whose sum is σ = 33996234240. Its totient is φ = 11329526208.

The previous prime is 21245254003. The next prime is 21245254057. The reversal of 21245254005 is 50045254212.

It is not a de Polignac number, because 21245254005 - 2¹ = 21245254003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245254001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66559 + ... + 216611.

It is an arithmetic number, because the mean of its divisors is an integer number (2124764640).

Almost surely, 2^21245254005 is an apocalyptic number.

It is an amenable number.

21245254005 is a deficient number, since it is larger than the sum of its proper divisors (12750980235).

21245254005 is a wasteful number, since it uses less digits than its factorization.

21245254005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159500.

The product of its (nonzero) digits is 16000, while the sum is 30.

The spelling of 21245254005 in words is "twenty-one billion, two hundred forty-five million, two hundred fifty-four thousand, five".