21221012102019 has 4 divisors (see below), whose sum is σ = 28294682802696. Its totient is φ = 14147341401344.

The previous prime is 21221012101997. The next prime is 21221012102033. The reversal of 21221012102019 is 91020121012212.

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 21221012102019 - 2¹¹ = 21221012099971 is a prime.

It is a super-2 number, since 2×21221012102019² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21221012102019.

It is not an unprimeable number, because it can be changed into a prime (21221012102089) 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, 3536835350334 + ... + 3536835350339.

It is an arithmetic number, because the mean of its divisors is an integer number (7073670700674).

Almost surely, 2^{21221012102019} is an apocalyptic number.

21221012102019 is a deficient number, since it is larger than the sum of its proper divisors (7073670700677).

21221012102019 is an equidigital number, since it uses as much as digits as its factorization.

21221012102019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7073670700676.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 21221012102019 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred two thousand, nineteen".