21004141020 has 48 divisors (see below), whose sum is σ = 59520182400. Its totient is φ = 5533619776.

The previous prime is 21004141013. The next prime is 21004141031. The reversal of 21004141020 is 2014140012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2103870 + ... + 2113829.

It is an arithmetic number, because the mean of its divisors is an integer number (1240003800).

Almost surely, 2^21004141020 is an apocalyptic number.

21004141020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21004141020 is an abundant number, since it is smaller than the sum of its proper divisors (38516041380).

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

21004141020 is a wasteful number, since it uses less digits than its factorization.

21004141020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4217794 (or 4217792 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21004141020 its reverse (2014140012), we get a palindrome (23018281032).

The spelling of 21004141020 in words is "twenty-one billion, four million, one hundred forty-one thousand, twenty".