21653244651406 has 32 divisors (see below), whose sum is σ = 33072794812800. Its totient is φ = 10629457505760.

The previous prime is 21653244651359. The next prime is 21653244651433. The reversal of 21653244651406 is 60415644235612.

It is a self number, because there is not a number n which added to its sum of digits gives 21653244651406.

It is a congruent number.

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, 424789501 + ... + 424840471.

It is an arithmetic number, because the mean of its divisors is an integer number (1033524837900).

Almost surely, 2^{21653244651406} is an apocalyptic number.

21653244651406 is a deficient number, since it is larger than the sum of its proper divisors (11419550161394).

21653244651406 is a wasteful number, since it uses less digits than its factorization.

21653244651406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55584.

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 21653244651406 in words is "twenty-one trillion, six hundred fifty-three billion, two hundred forty-four million, six hundred fifty-one thousand, four hundred six".