4972877721 has 12 divisors (see below), whose sum is σ = 8209195072. Its totient is φ = 2841644376.

The previous prime is 4972877677. The next prime is 4972877729. The reversal of 4972877721 is 1277782794.

4972877721 is a `hidden beast` number, since 497 + 2 + 87 + 7 + 72 + 1 = 666.

It is not a de Polignac number, because 4972877721 - 2⁷ = 4972877593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4972877729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39467221 + ... + 39467346.

Almost surely, 2^4972877721 is an apocalyptic number.

It is an amenable number.

4972877721 is a deficient number, since it is larger than the sum of its proper divisors (3236317351).

4972877721 is a wasteful number, since it uses less digits than its factorization.

4972877721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78934580 (or 78934577 counting only the distinct ones).

The product of its digits is 2765952, while the sum is 54.

The square root of 4972877721 is about 70518.6338565914. The cubic root of 4972877721 is about 1706.8784428355.

It can be divided in two parts, 49728 and 77721, that added together give a square (127449 = 357²).

The spelling of 4972877721 in words is "four billion, nine hundred seventy-two million, eight hundred seventy-seven thousand, seven hundred twenty-one".