7721240115 has 16 divisors (see below), whose sum is σ = 13080689568. Its totient is φ = 3875759616.

The previous prime is 7721240099. The next prime is 7721240141. The reversal of 7721240115 is 5110421277.

It is not a de Polignac number, because 7721240115 - 2⁴ = 7721240099 is a prime.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15139432 + ... + 15139941.

It is an arithmetic number, because the mean of its divisors is an integer number (817543098).

Almost surely, 2^7721240115 is an apocalyptic number.

7721240115 is a deficient number, since it is larger than the sum of its proper divisors (5359449453).

7721240115 is a wasteful number, since it uses less digits than its factorization.

7721240115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30279398.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 7721240115 is about 87870.5873145275. The cubic root of 7721240115 is about 1976.4948456440.

The spelling of 7721240115 in words is "seven billion, seven hundred twenty-one million, two hundred forty thousand, one hundred fifteen".