21553101124040 has 16 divisors (see below), whose sum is σ = 48494477529180. Its totient is φ = 8621240449600.

The previous prime is 21553101123989. The next prime is 21553101124099. The reversal of 21553101124040 is 4042110135512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19671655455076 + 1881445668964 = 4435274^2 + 1371658^2 .

It is a super-2 number, since 2×21553101124040² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21553101123994 and 21553101124012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269413764011 + ... + 269413764090.

Almost surely, 2^{21553101124040} is an apocalyptic number.

21553101124040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21553101124040 is an abundant number, since it is smaller than the sum of its proper divisors (26941376405140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21553101124040 is a wasteful number, since it uses less digits than its factorization.

21553101124040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538827528112 (or 538827528108 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 21553101124040 its reverse (4042110135512), we get a palindrome (25595211259552).

The spelling of 21553101124040 in words is "twenty-one trillion, five hundred fifty-three billion, one hundred one million, one hundred twenty-four thousand, forty".