21101221221010 has 32 divisors (see below), whose sum is σ = 43409155865472. Its totient is φ = 7234549526400.

The previous prime is 21101221220993. The next prime is 21101221221037. The reversal of 21101221221010 is 1012212210112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90174 + ... + 6496966.

It is an arithmetic number, because the mean of its divisors is an integer number (1356536120796).

Almost surely, 2^{21101221221010} is an apocalyptic number.

21101221221010 is an abundant number, since it is smaller than the sum of its proper divisors (22307934644462).

21101221221010 is a wasteful number, since it uses less digits than its factorization.

21101221221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6453858.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21101221221010 its reverse (1012212210112), we get a palindrome (22113433431122).

The spelling of 21101221221010 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-one million, two hundred twenty-one thousand, ten".