21062107289 has 4 divisors (see below), whose sum is σ = 21062818320. Its totient is φ = 21061396260.

The previous prime is 21062107277. The next prime is 21062107309. The reversal of 21062107289 is 98270126012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21062107289 is a prime.

It is a super-2 number, since 2×21062107289² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21062107219) 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, 309059 + ... + 371000.

It is an arithmetic number, because the mean of its divisors is an integer number (5265704580).

Almost surely, 2^21062107289 is an apocalyptic number.

It is an amenable number.

21062107289 is a deficient number, since it is larger than the sum of its proper divisors (711031).

21062107289 is an equidigital number, since it uses as much as digits as its factorization.

21062107289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711030.

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 21062107289 in words is "twenty-one billion, sixty-two million, one hundred seven thousand, two hundred eighty-nine".