21620101601 has 8 divisors (see below), whose sum is σ = 24732943680. Its totient is φ = 18513323568.

The previous prime is 21620101589. The next prime is 21620101603. The reversal of 21620101601 is 10610102612.

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

It is a cyclic number.

It is not a de Polignac number, because 21620101601 - 2¹⁰ = 21620100577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21620101603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1508366 + ... + 1522631.

It is an arithmetic number, because the mean of its divisors is an integer number (3091617960).

Almost surely, 2^21620101601 is an apocalyptic number.

It is an amenable number.

21620101601 is a deficient number, since it is larger than the sum of its proper divisors (3112842079).

21620101601 is a wasteful number, since it uses less digits than its factorization.

21620101601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032023.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21620101601 in words is "twenty-one billion, six hundred twenty million, one hundred one thousand, six hundred one".