6521217000 has 128 divisors (see below), whose sum is σ = 21543200640. Its totient is φ = 1636684800.

The previous prime is 6521216981. The next prime is 6521217007. The reversal of 6521217000 is 7121256.

It is a super-2 number, since 2×6521217000² = 85052542322178000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (6521217007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12934 + ... + 114933.

It is an arithmetic number, because the mean of its divisors is an integer number (168306255).

Almost surely, 2^6521217000 is an apocalyptic number.

6521217000 is a gapful number since it is divisible by the number (60) 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 6521217000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10771600320).

6521217000 is an abundant number, since it is smaller than the sum of its proper divisors (15021983640).

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

6521217000 is a wasteful number, since it uses less digits than its factorization.

6521217000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127908 (or 127894 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 6521217000 is about 80754.0525298886. The cubic root of 6521217000 is about 1868.2839548041.

Adding to 6521217000 its reverse (7121256), we get a palindrome (6528338256).

The spelling of 6521217000 in words is "six billion, five hundred twenty-one million, two hundred seventeen thousand".