21528494654 has 8 divisors (see below), whose sum is σ = 33992360040. Its totient is φ = 10197707976.

The previous prime is 21528494651. The next prime is 21528494657. The reversal of 21528494654 is 45649482512.

It is an interprime number because it is at equal distance from previous prime (21528494651) and next prime (21528494657).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21528494651) 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, 283269629 + ... + 283269704.

It is an arithmetic number, because the mean of its divisors is an integer number (4249045005).

Almost surely, 2^21528494654 is an apocalyptic number.

21528494654 is a deficient number, since it is larger than the sum of its proper divisors (12463865386).

21528494654 is a wasteful number, since it uses less digits than its factorization.

21528494654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566539354.

The product of its digits is 2764800, while the sum is 50.

The spelling of 21528494654 in words is "twenty-one billion, five hundred twenty-eight million, four hundred ninety-four thousand, six hundred fifty-four".