21747710641220 has 24 divisors (see below), whose sum is σ = 45902020742424. Its totient is φ = 8654926466816.

The previous prime is 21747710641213. The next prime is 21747710641229. The reversal of 21747710641220 is 2214601774712.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2995640947264 + 18752069693956 = 1730792^2 + 4330366^2 .

It is not an unprimeable number, because it can be changed into a prime (21747710641229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2759857817 + ... + 2759865696.

It is an arithmetic number, because the mean of its divisors is an integer number (1912584197601).

Almost surely, 2^{21747710641220} is an apocalyptic number.

21747710641220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21747710641220 is an abundant number, since it is smaller than the sum of its proper divisors (24154310101204).

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

21747710641220 is a wasteful number, since it uses less digits than its factorization.

21747710641220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5519723719 (or 5519723717 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 44.

The spelling of 21747710641220 in words is "twenty-one trillion, seven hundred forty-seven billion, seven hundred ten million, six hundred forty-one thousand, two hundred twenty".