7121520000 has 800 divisors, whose sum is σ = 30459562320. Its totient is φ = 1617408000.

The previous prime is 7121519989. The next prime is 7121520019. The reversal of 7121520000 is 251217.

It is a tau number, because it is divible by the number of its divisors (800).

It is a super-2 number, since 2×7121520000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 45359922 + ... + 45360078.

Almost surely, 2^7121520000 is an apocalyptic number.

7121520000 is a gapful number since it is divisible by the number (70) 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 7121520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15229781160).

7121520000 is an abundant number, since it is smaller than the sum of its proper divisors (23338042320).

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

7121520000 is an equidigital number, since it uses as much as digits as its factorization.

7121520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 7121520000 is about 84389.0988220635. The cubic root of 7121520000 is about 1923.9372331245.

Adding to 7121520000 its reverse (251217), we get a palindrome (7121771217).

The spelling of 7121520000 in words is "seven billion, one hundred twenty-one million, five hundred twenty thousand".