220421666511 has 24 divisors (see below), whose sum is σ = 338054614560. Its totient is φ = 137918509056.

The previous prime is 220421666497. The next prime is 220421666551. The reversal of 220421666511 is 115666124022.

It is not a de Polignac number, because 220421666511 - 2¹³ = 220421658319 is a prime.

It is a super-2 number, since 2×220421666511² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220421666551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1951570 + ... + 2061423.

It is an arithmetic number, because the mean of its divisors is an integer number (14085608940).

Almost surely, 2^220421666511 is an apocalyptic number.

220421666511 is a deficient number, since it is larger than the sum of its proper divisors (117632948049).

220421666511 is a wasteful number, since it uses less digits than its factorization.

220421666511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013375 (or 4013372 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 220421666511 in words is "two hundred twenty billion, four hundred twenty-one million, six hundred sixty-six thousand, five hundred eleven".