21021212111019 has 4 divisors (see below), whose sum is σ = 28028282814696. Its totient is φ = 14014141407344.

The previous prime is 21021212111017. The next prime is 21021212111051. The reversal of 21021212111019 is 91011121212012.

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 21021212111019 - 2¹ = 21021212111017 is a prime.

It is a super-2 number, since 2×21021212111019² (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 21021212111019.

It is not an unprimeable number, because it can be changed into a prime (21021212111017) 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, 3503535351834 + ... + 3503535351839.

It is an arithmetic number, because the mean of its divisors is an integer number (7007070703674).

Almost surely, 2^{21021212111019} is an apocalyptic number.

21021212111019 is a deficient number, since it is larger than the sum of its proper divisors (7007070703677).

21021212111019 is an equidigital number, since it uses as much as digits as its factorization.

21021212111019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007070703676.

The product of its (nonzero) digits is 144, while the sum is 24.

The spelling of 21021212111019 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred eleven thousand, nineteen".