21122266193521 has 8 divisors (see below), whose sum is σ = 21420134273664. Its totient is φ = 20824408429440.

The previous prime is 21122266193519. The next prime is 21122266193549. The reversal of 21122266193521 is 12539166222112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122266193521 - 2¹ = 21122266193519 is a prime.

It is a super-2 number, since 2×21122266193521² (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 (21122266193921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1592116 + ... + 6691738.

It is an arithmetic number, because the mean of its divisors is an integer number (2677516784208).

Almost surely, 2^{21122266193521} is an apocalyptic number.

It is an amenable number.

21122266193521 is a deficient number, since it is larger than the sum of its proper divisors (297868080143).

21122266193521 is an equidigital number, since it uses as much as digits as its factorization.

21122266193521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5158031.

The product of its digits is 155520, while the sum is 43.

The spelling of 21122266193521 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred sixty-six million, one hundred ninety-three thousand, five hundred twenty-one".