21220110019949 has 2 divisors, whose sum is σ = 21220110019950. Its totient is φ = 21220110019948.

The previous prime is 21220110019837. The next prime is 21220110020033. The reversal of 21220110019949 is 94991001102212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19338727446724 + 1881382573225 = 4397582^2 + 1371635^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220110019949 - 2⁴⁰ = 20120598392173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220110016949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610055009974 + 10610055009975.

It is an arithmetic number, because the mean of its divisors is an integer number (10610055009975).

Almost surely, 2^{21220110019949} is an apocalyptic number.

It is an amenable number.

21220110019949 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220110019949 is an equidigital number, since it uses as much as digits as its factorization.

21220110019949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 21220110019949 in words is "twenty-one trillion, two hundred twenty billion, one hundred ten million, nineteen thousand, nine hundred forty-nine".