21488628101 has 4 divisors (see below), whose sum is σ = 21490407852. Its totient is φ = 21486848352.

The previous prime is 21488628013. The next prime is 21488628149. The reversal of 21488628101 is 10182688412.

It is a Cunningham number, because it is equal to 146590²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1009587076 + 20479041025 = 31774^2 + 143105^2 .

It is a cyclic number.

It is not a de Polignac number, because 21488628101 - 2¹⁰ = 21488627077 is a prime.

It is a super-2 number, since 2×21488628101² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488621101) 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 3 ways as a sum of consecutive naturals, for example, 871640 + ... + 895953.

It is an arithmetic number, because the mean of its divisors is an integer number (5372601963).

Almost surely, 2^21488628101 is an apocalyptic number.

It is an amenable number.

21488628101 is a deficient number, since it is larger than the sum of its proper divisors (1779751).

21488628101 is a wasteful number, since it uses less digits than its factorization.

21488628101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779750.

The product of its (nonzero) digits is 49152, while the sum is 41.

The spelling of 21488628101 in words is "twenty-one billion, four hundred eighty-eight million, six hundred twenty-eight thousand, one hundred one".