21553730745446 has 64 divisors (see below), whose sum is σ = 35009604241920. Its totient is φ = 9914895260160.

The previous prime is 21553730745433. The next prime is 21553730745451. The reversal of 21553730745446 is 64454703735512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21553730745391 and 21553730745400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 228501425 + ... + 228595731.

It is an arithmetic number, because the mean of its divisors is an integer number (547025066280).

Almost surely, 2^{21553730745446} is an apocalyptic number.

21553730745446 is a deficient number, since it is larger than the sum of its proper divisors (13455873496474).

21553730745446 is a wasteful number, since it uses less digits than its factorization.

21553730745446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95069.

The product of its (nonzero) digits is 42336000, while the sum is 56.

The spelling of 21553730745446 in words is "twenty-one trillion, five hundred fifty-three billion, seven hundred thirty million, seven hundred forty-five thousand, four hundred forty-six".