21653040642546 has 32 divisors (see below), whose sum is σ = 44049187600128. Its totient is φ = 7094007498240.

The previous prime is 21653040642533. The next prime is 21653040642601. The reversal of 21653040642546 is 64524604035612.

It is a junction number, because it is equal to n+sod(n) for n = 21653040642495 and 21653040642504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21805695 + ... + 22777058.

It is an arithmetic number, because the mean of its divisors is an integer number (1376537112504).

Almost surely, 2^{21653040642546} is an apocalyptic number.

21653040642546 is an abundant number, since it is smaller than the sum of its proper divisors (22396146957582).

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

21653040642546 is a wasteful number, since it uses less digits than its factorization.

21653040642546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44584146.

The product of its (nonzero) digits is 4147200, while the sum is 48.

The spelling of 21653040642546 in words is "twenty-one trillion, six hundred fifty-three billion, forty million, six hundred forty-two thousand, five hundred forty-six".