21174114477 has 4 divisors (see below), whose sum is σ = 28232152640. Its totient is φ = 14116076316.

The previous prime is 21174114449. The next prime is 21174114527. The reversal of 21174114477 is 77441147112.

It is a happy number.

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 not a de Polignac number, because 21174114477 - 2¹² = 21174110381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21174114407) 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, 3529019077 + ... + 3529019082.

It is an arithmetic number, because the mean of its divisors is an integer number (7058038160).

Almost surely, 2^21174114477 is an apocalyptic number.

It is an amenable number.

21174114477 is a deficient number, since it is larger than the sum of its proper divisors (7058038163).

21174114477 is an equidigital number, since it uses as much as digits as its factorization.

21174114477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7058038162.

The product of its digits is 43904, while the sum is 39.

The spelling of 21174114477 in words is "twenty-one billion, one hundred seventy-four million, one hundred fourteen thousand, four hundred seventy-seven".