10521543900 has 144 divisors (see below), whose sum is σ = 35232189440. Its totient is φ = 2374444800.

The previous prime is 10521543841. The next prime is 10521543983. The reversal of 10521543900 is 934512501.

It is a super-2 number, since 2×10521543900² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134190 + ... + 197610.

Almost surely, 2^10521543900 is an apocalyptic number.

10521543900 is a gapful number since it is divisible by the number (10) 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 10521543900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17616094720).

10521543900 is an abundant number, since it is smaller than the sum of its proper divisors (24710645540).

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

10521543900 is a wasteful number, since it uses less digits than its factorization.

10521543900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63524 (or 63517 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 10521543900 in words is "ten billion, five hundred twenty-one million, five hundred forty-three thousand, nine hundred".