21212221102019 has 4 divisors (see below), whose sum is σ = 21212270399496. Its totient is φ = 21212171804544.

The previous prime is 21212221101991. The next prime is 21212221102021. The reversal of 21212221102019 is 91020112221212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21212221102019 - 2¹⁶ = 21212221036483 is a prime.

It is a super-2 number, since 2×21212221102019² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212221102049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23997569 + ... + 24865794.

It is an arithmetic number, because the mean of its divisors is an integer number (5303067599874).

Almost surely, 2^{21212221102019} is an apocalyptic number.

21212221102019 is a deficient number, since it is larger than the sum of its proper divisors (49297477).

21212221102019 is an equidigital number, since it uses as much as digits as its factorization.

21212221102019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49297476.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 21212221102019 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred two thousand, nineteen".