21124055355450 has 48 divisors (see below), whose sum is σ = 52405115131776. Its totient is φ = 5631204240000.

The previous prime is 21124055355443. The next prime is 21124055355457. The reversal of 21124055355450 is 5455355042112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21124055355443) and next prime (21124055355457).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21124055355457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23013202 + ... + 23913501.

It is an arithmetic number, because the mean of its divisors is an integer number (1091773231912).

Almost surely, 2^{21124055355450} is an apocalyptic number.

21124055355450 is an abundant number, since it is smaller than the sum of its proper divisors (31281059776326).

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

21124055355450 is a wasteful number, since it uses less digits than its factorization.

21124055355450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46929719 (or 46929714 counting only the distinct ones).

The product of its (nonzero) digits is 600000, while the sum is 42.

The spelling of 21124055355450 in words is "twenty-one trillion, one hundred twenty-four billion, fifty-five million, three hundred fifty-five thousand, four hundred fifty".