21163533133620 has 96 divisors (see below), whose sum is σ = 60144145423488. Its totient is φ = 5559208883712.

The previous prime is 21163533133559. The next prime is 21163533133649. The reversal of 21163533133620 is 2633133536112.

It is a super-4 number, since 4×21163533133620⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191509822 + ... + 191620298.

It is an arithmetic number, because the mean of its divisors is an integer number (626501514828).

Almost surely, 2^{21163533133620} is an apocalyptic number.

21163533133620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21163533133620 is an abundant number, since it is smaller than the sum of its proper divisors (38980612289868).

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

21163533133620 is a wasteful number, since it uses less digits than its factorization.

21163533133620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158209 (or 158207 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 39.

Adding to 21163533133620 its reverse (2633133536112), we get a palindrome (23796666669732).

The spelling of 21163533133620 in words is "twenty-one trillion, one hundred sixty-three billion, five hundred thirty-three million, one hundred thirty-three thousand, six hundred twenty".