21114553020 has 192 divisors, whose sum is σ = 65824012800. Its totient is φ = 5013872640.

The previous prime is 21114552937. The next prime is 21114553037. The reversal of 21114553020 is 2035541112.

It is a happy number.

It is a super-2 number, since 2×21114553020² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13121976 + ... + 13123584.

It is an arithmetic number, because the mean of its divisors is an integer number (342833400).

Almost surely, 2^21114553020 is an apocalyptic number.

21114553020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21114553020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32912006400).

21114553020 is an abundant number, since it is smaller than the sum of its proper divisors (44709459780).

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

21114553020 is a wasteful number, since it uses less digits than its factorization.

21114553020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028 (or 2026 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 21114553020 in words is "twenty-one billion, one hundred fourteen million, five hundred fifty-three thousand, twenty".