21445077337 has 4 divisors (see below), whose sum is σ = 21506524900. Its totient is φ = 21383629776.

The previous prime is 21445077317. The next prime is 21445077349. The reversal of 21445077337 is 73377054412.

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 16555711561 + 4889365776 = 128669^2 + 69924^2 .

It is a cyclic number.

It is not a de Polignac number, because 21445077337 - 2²³ = 21436688729 is a prime.

It is a super-2 number, since 2×21445077337² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21445077293 and 21445077302.

It is not an unprimeable number, because it can be changed into a prime (21445077317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30723258 + ... + 30723955.

It is an arithmetic number, because the mean of its divisors is an integer number (5376631225).

Almost surely, 2^21445077337 is an apocalyptic number.

It is an amenable number.

21445077337 is a deficient number, since it is larger than the sum of its proper divisors (61447563).

21445077337 is an equidigital number, since it uses as much as digits as its factorization.

21445077337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61447562.

The product of its (nonzero) digits is 493920, while the sum is 43.

The spelling of 21445077337 in words is "twenty-one billion, four hundred forty-five million, seventy-seven thousand, three hundred thirty-seven".