21220012341051 has 24 divisors (see below), whose sum is σ = 29060809405440. Its totient is φ = 13772819042880.

The previous prime is 21220012341043. The next prime is 21220012341079. The reversal of 21220012341051 is 15014321002212.

It is a happy number.

It is not a de Polignac number, because 21220012341051 - 2³ = 21220012341043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220012341001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1976695 + ... + 6807888.

It is an arithmetic number, because the mean of its divisors is an integer number (1210867058560).

Almost surely, 2^{21220012341051} is an apocalyptic number.

21220012341051 is a deficient number, since it is larger than the sum of its proper divisors (7840797064389).

21220012341051 is an equidigital number, since it uses as much as digits as its factorization.

21220012341051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8785147 (or 8785106 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21220012341051 its reverse (15014321002212), we get a palindrome (36234333343263).

The spelling of 21220012341051 in words is "twenty-one trillion, two hundred twenty billion, twelve million, three hundred forty-one thousand, fifty-one".