21250445232651 has 8 divisors (see below), whose sum is σ = 29825186291520. Its totient is φ = 13421333831112.

The previous prime is 21250445232617. The next prime is 21250445232659. The reversal of 21250445232651 is 15623254405212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21250445232651 - 2¹¹ = 21250445230603 is a prime.

It is a super-2 number, since 2×21250445232651² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21250445232659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186407414265 + ... + 186407414378.

It is an arithmetic number, because the mean of its divisors is an integer number (3728148286440).

Almost surely, 2^{21250445232651} is an apocalyptic number.

21250445232651 is a deficient number, since it is larger than the sum of its proper divisors (8574741058869).

21250445232651 is a wasteful number, since it uses less digits than its factorization.

21250445232651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372814828665.

The product of its (nonzero) digits is 576000, while the sum is 42.

Adding to 21250445232651 its reverse (15623254405212), we get a palindrome (36873699637863).

The spelling of 21250445232651 in words is "twenty-one trillion, two hundred fifty billion, four hundred forty-five million, two hundred thirty-two thousand, six hundred fifty-one".