21213155420411 has 4 divisors (see below), whose sum is σ = 21213816525000. Its totient is φ = 21212494315824.

The previous prime is 21213155420383. The next prime is 21213155420453. The reversal of 21213155420411 is 11402455131212.

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 21213155420411 - 2²² = 21213151226107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213155420711) 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, 330504161 + ... + 330568338.

It is an arithmetic number, because the mean of its divisors is an integer number (5303454131250).

Almost surely, 2^{21213155420411} is an apocalyptic number.

21213155420411 is a deficient number, since it is larger than the sum of its proper divisors (661104589).

21213155420411 is an equidigital number, since it uses as much as digits as its factorization.

21213155420411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661104588.

The product of its (nonzero) digits is 9600, while the sum is 32.

The spelling of 21213155420411 in words is "twenty-one trillion, two hundred thirteen billion, one hundred fifty-five million, four hundred twenty thousand, four hundred eleven".