21063090417 has 4 divisors (see below), whose sum is σ = 28084120560. Its totient is φ = 14042060276.

The previous prime is 21063090409. The next prime is 21063090431. The reversal of 21063090417 is 71409036012.

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 not a de Polignac number, because 21063090417 - 2³ = 21063090409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21063090407) 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, 3510515067 + ... + 3510515072.

It is an arithmetic number, because the mean of its divisors is an integer number (7021030140).

Almost surely, 2^21063090417 is an apocalyptic number.

It is an amenable number.

21063090417 is a deficient number, since it is larger than the sum of its proper divisors (7021030143).

21063090417 is an equidigital number, since it uses as much as digits as its factorization.

21063090417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7021030142.

The product of its (nonzero) digits is 9072, while the sum is 33.

The spelling of 21063090417 in words is "twenty-one billion, sixty-three million, ninety thousand, four hundred seventeen".