21056464654 has 8 divisors (see below), whose sum is σ = 31591504800. Its totient is φ = 10525963056.

The previous prime is 21056464651. The next prime is 21056464703. The reversal of 21056464654 is 45646465012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21056464654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21056464651) 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, 1123014 + ... + 1141609.

It is an arithmetic number, because the mean of its divisors is an integer number (3948938100).

Almost surely, 2^21056464654 is an apocalyptic number.

21056464654 is a deficient number, since it is larger than the sum of its proper divisors (10535040146).

21056464654 is a wasteful number, since it uses less digits than its factorization.

21056464654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269274.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 21056464654 in words is "twenty-one billion, fifty-six million, four hundred sixty-four thousand, six hundred fifty-four".