21020041210 has 64 divisors (see below), whose sum is σ = 44260250112. Its totient is φ = 7038959616.

The previous prime is 21020041201. The next prime is 21020041243. The reversal of 21020041210 is 1214002012.

It is a happy 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, 506362 + ... + 546298.

It is an arithmetic number, because the mean of its divisors is an integer number (691566408).

Almost surely, 2^21020041210 is an apocalyptic number.

21020041210 is an abundant number, since it is smaller than the sum of its proper divisors (23240208902).

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

21020041210 is a wasteful number, since it uses less digits than its factorization.

21020041210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40127.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21020041210 its reverse (1214002012), we get a palindrome (22234043222).

The spelling of 21020041210 in words is "twenty-one billion, twenty million, forty-one thousand, two hundred ten".