20311553421 has 12 divisors (see below), whose sum is σ = 29892475548. Its totient is φ = 13285544064.

The previous prime is 20311553333. The next prime is 20311553441. The reversal of 20311553421 is 12435511302.

20311553421 is a `hidden beast` number, since 2 + 0 + 311 + 5 + 5 + 342 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14771728521 + 5539824900 = 121539^2 + 74430^2 .

It is not a de Polignac number, because 20311553421 - 2¹¹ = 20311551373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311553441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21290460 + ... + 21291413.

It is an arithmetic number, because the mean of its divisors is an integer number (2491039629).

Almost surely, 2^20311553421 is an apocalyptic number.

It is an amenable number.

20311553421 is a deficient number, since it is larger than the sum of its proper divisors (9580922127).

20311553421 is a wasteful number, since it uses less digits than its factorization.

20311553421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42581932 (or 42581929 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 20311553421 in words is "twenty billion, three hundred eleven million, five hundred fifty-three thousand, four hundred twenty-one".