21211221000019 has 16 divisors (see below), whose sum is σ = 21746589086880. Its totient is φ = 20676716605440.

The previous prime is 21211220999987. The next prime is 21211221000037. The reversal of 21211221000019 is 91000012211212.

It is a cyclic number.

It is not a de Polignac number, because 21211221000019 - 2⁵ = 21211220999987 is a prime.

It is a super-2 number, since 2×21211221000019² (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 (21211221000059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339364579 + ... + 339427075.

It is an arithmetic number, because the mean of its divisors is an integer number (1359161817930).

Almost surely, 2^{21211221000019} is an apocalyptic number.

21211221000019 is a deficient number, since it is larger than the sum of its proper divisors (535368086861).

21211221000019 is a wasteful number, since it uses less digits than its factorization.

21211221000019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69270.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 21211221000019 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, nineteen", and thus it is an aban number.