21501224445 has 16 divisors (see below), whose sum is σ = 34410503232. Its totient is φ = 11464471680.

The previous prime is 21501224431. The next prime is 21501224483. The reversal of 21501224445 is 54442210512.

It is not a de Polignac number, because 21501224445 - 2¹⁰ = 21501223421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114871 + ... + 237060.

It is an arithmetic number, because the mean of its divisors is an integer number (2150656452).

Almost surely, 2^21501224445 is an apocalyptic number.

It is an amenable number.

21501224445 is a deficient number, since it is larger than the sum of its proper divisors (12909278787).

21501224445 is a wasteful number, since it uses less digits than its factorization.

21501224445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356012.

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 21501224445 its reverse (54442210512), we get a palindrome (75943434957).

The spelling of 21501224445 in words is "twenty-one billion, five hundred one million, two hundred twenty-four thousand, four hundred forty-five".