7721200000 has 192 divisors, whose sum is σ = 19522188000. Its totient is φ = 3041280000.

The previous prime is 7721199943. The next prime is 7721200009. The reversal of 7721200000 is 21277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721200009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38799901 + ... + 38800099.

Almost surely, 2^7721200000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7721200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9761094000).

7721200000 is an abundant number, since it is smaller than the sum of its proper divisors (11800988000).

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

7721200000 is an frugal number, since it uses more digits than its factorization.

7721200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 7721200000 is about 87870.3590524131. The cubic root of 7721200000 is about 1976.4914227384.

Adding to 7721200000 its reverse (21277), we get a palindrome (7721221277).

The spelling of 7721200000 in words is "seven billion, seven hundred twenty-one million, two hundred thousand".