21020221201210 has 64 divisors (see below), whose sum is σ = 47177134663680. Its totient is φ = 6551134701120.

The previous prime is 21020221201193. The next prime is 21020221201219. The reversal of 21020221201210 is 1210212202012.

It is a happy number.

It is a super-3 number, since 3×21020221201210³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020221201219) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 6844881 + ... + 9428299.

It is an arithmetic number, because the mean of its divisors is an integer number (737142729120).

Almost surely, 2^{21020221201210} is an apocalyptic number.

21020221201210 is an abundant number, since it is smaller than the sum of its proper divisors (26156913462470).

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

21020221201210 is a wasteful number, since it uses less digits than its factorization.

21020221201210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2594011.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020221201210 its reverse (1210212202012), we get a palindrome (22230433403222).

It can be divided in two parts, 210202 and 21201210, that added together give a palindrome (21411412).

The spelling of 21020221201210 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, two hundred one thousand, two hundred ten".