21701444651 has 2 divisors, whose sum is σ = 21701444652. Its totient is φ = 21701444650.

The previous prime is 21701444617. The next prime is 21701444663. The reversal of 21701444651 is 15644410712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21701444651 - 2¹⁴ = 21701428267 is a prime.

It is not a weakly prime, because it can be changed into another prime (21701443651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10850722325 + 10850722326.

It is an arithmetic number, because the mean of its divisors is an integer number (10850722326).

Almost surely, 2^21701444651 is an apocalyptic number.

21701444651 is a deficient number, since it is larger than the sum of its proper divisors (1).

21701444651 is an equidigital number, since it uses as much as digits as its factorization.

21701444651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 21701444651 in words is "twenty-one billion, seven hundred one million, four hundred forty-four thousand, six hundred fifty-one".