8400950721 has 40 divisors (see below), whose sum is σ = 13399869120. Its totient is φ = 5232493728.

The previous prime is 8400950713. The next prime is 8400950729. The reversal of 8400950721 is 1270590048.

It is an interprime number because it is at equal distance from previous prime (8400950713) and next prime (8400950729).

It is not a de Polignac number, because 8400950721 - 2³ = 8400950713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8400950729) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 27675 + ... + 132543.

It is an arithmetic number, because the mean of its divisors is an integer number (334996728).

Almost surely, 2^8400950721 is an apocalyptic number.

8400950721 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8400950721 is a deficient number, since it is larger than the sum of its proper divisors (4998918399).

8400950721 is a wasteful number, since it uses less digits than its factorization.

8400950721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104947 (or 104938 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 8400950721 is about 91656.7003606392. The cubic root of 8400950721 is about 2032.8694019557.

The spelling of 8400950721 in words is "eight billion, four hundred million, nine hundred fifty thousand, seven hundred twenty-one".