21651113471 has 8 divisors (see below), whose sum is σ = 23459632560. Its totient is φ = 19863029952.

The previous prime is 21651113467. The next prime is 21651113501. The reversal of 21651113471 is 17431115612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21651113471 - 2² = 21651113467 is a prime.

It is a super-3 number, since 3×21651113471³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21651113401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5106686 + ... + 5110923.

It is an arithmetic number, because the mean of its divisors is an integer number (2932454070).

Almost surely, 2^21651113471 is an apocalyptic number.

21651113471 is a deficient number, since it is larger than the sum of its proper divisors (1808519089).

21651113471 is a wasteful number, since it uses less digits than its factorization.

21651113471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10217785.

The product of its digits is 5040, while the sum is 32.

The spelling of 21651113471 in words is "twenty-one billion, six hundred fifty-one million, one hundred thirteen thousand, four hundred seventy-one".