21101221202010 has 128 divisors (see below), whose sum is σ = 52914015866880. Its totient is φ = 5380316815104.

The previous prime is 21101221201987. The next prime is 21101221202059. The reversal of 21101221202010 is 1020212210112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30822447 + ... + 31499613.

It is an arithmetic number, because the mean of its divisors is an integer number (413390748960).

Almost surely, 2^{21101221202010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21101221202010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26457007933440).

21101221202010 is an abundant number, since it is smaller than the sum of its proper divisors (31812794664870).

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

21101221202010 is a wasteful number, since it uses less digits than its factorization.

21101221202010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677700.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21101221202010 its reverse (1020212210112), we get a palindrome (22121433412122).

The spelling of 21101221202010 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-one million, two hundred two thousand, ten".