21563157054 has 8 divisors (see below), whose sum is σ = 43126314120. Its totient is φ = 7187719016.

The previous prime is 21563157047. The next prime is 21563157163. The reversal of 21563157054 is 45075136512.

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

21563157054 is an admirable number.

It is a super-4 number, since 4×21563157054⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796929749 + ... + 1796929760.

It is an arithmetic number, because the mean of its divisors is an integer number (5390789265).

Almost surely, 2^21563157054 is an apocalyptic number.

21563157054 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21563157054 is a wasteful number, since it uses less digits than its factorization.

21563157054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593859514.

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 21563157054 in words is "twenty-one billion, five hundred sixty-three million, one hundred fifty-seven thousand, fifty-four".