21220102019 has 2 divisors, whose sum is σ = 21220102020. Its totient is φ = 21220102018.

The previous prime is 21220101979. The next prime is 21220102061. The reversal of 21220102019 is 91020102212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220102019 is a prime.

It is a super-2 number, since 2×21220102019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21220102069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610051009 + 10610051010.

It is an arithmetic number, because the mean of its divisors is an integer number (10610051010).

Almost surely, 2^21220102019 is an apocalyptic number.

21220102019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220102019 is an equidigital number, since it uses as much as digits as its factorization.

21220102019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21220102019 in words is "twenty-one billion, two hundred twenty million, one hundred two thousand, nineteen".