21020244144020 has 24 divisors (see below), whose sum is σ = 48155468403168. Its totient is φ = 7643725143200.

The previous prime is 21020244144013. The next prime is 21020244144037. The reversal of 21020244144020 is 2044144202012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47773281926 + ... + 47773282365.

It is an arithmetic number, because the mean of its divisors is an integer number (2006477850132).

Almost surely, 2^{21020244144020} is an apocalyptic number.

21020244144020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020244144020 is an abundant number, since it is smaller than the sum of its proper divisors (27135224259148).

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

21020244144020 is a wasteful number, since it uses less digits than its factorization.

21020244144020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95546564311 (or 95546564309 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21020244144020 its reverse (2044144202012), we get a palindrome (23064388346032).

The spelling of 21020244144020 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty-four thousand, twenty".