120447821 has 12 divisors (see below), whose sum is σ = 137293920. Its totient is φ = 105328080.

The previous prime is 120447781. The next prime is 120447823. The reversal of 120447821 is 128744021.

It is not a de Polignac number, because 120447821 - 2²² = 116253517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120447823) 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, 15545 + ... + 21966.

It is an arithmetic number, because the mean of its divisors is an integer number (11441160).

Almost surely, 2^120447821 is an apocalyptic number.

It is an amenable number.

120447821 is a deficient number, since it is larger than the sum of its proper divisors (16846099).

120447821 is a wasteful number, since it uses less digits than its factorization.

120447821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37556 (or 37543 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 120447821 is about 10974.8722543818. The cubic root of 120447821 is about 493.8552207308.

The spelling of 120447821 in words is "one hundred twenty million, four hundred forty-seven thousand, eight hundred twenty-one".