21889135297 has 4 divisors (see below), whose sum is σ = 21923284356. Its totient is φ = 21854986240.

The previous prime is 21889135277. The next prime is 21889135319. The reversal of 21889135297 is 79253198812.

It is a happy number.

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 20645091856 + 1244043441 = 143684^2 + 35271^2 .

It is a cyclic number.

It is not a de Polignac number, because 21889135297 - 2¹¹ = 21889133249 is a prime.

It is a super-3 number, since 3×21889135297³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21889135217) 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, 17073568 + ... + 17074849.

It is an arithmetic number, because the mean of its divisors is an integer number (5480821089).

Almost surely, 2^21889135297 is an apocalyptic number.

It is an amenable number.

21889135297 is a deficient number, since it is larger than the sum of its proper divisors (34149059).

21889135297 is an equidigital number, since it uses as much as digits as its factorization.

21889135297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34149058.

The product of its digits is 2177280, while the sum is 55.

The spelling of 21889135297 in words is "twenty-one billion, eight hundred eighty-nine million, one hundred thirty-five thousand, two hundred ninety-seven".