1621120415 has 16 divisors (see below), whose sum is σ = 1964666880. Its totient is φ = 1284060960.

The previous prime is 1621120411. The next prime is 1621120421. The reversal of 1621120415 is 5140211261.

1621120415 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1621120415 - 2² = 1621120411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621120411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311162 + ... + 316328.

It is an arithmetic number, because the mean of its divisors is an integer number (122791680).

Almost surely, 2^1621120415 is an apocalyptic number.

1621120415 is a deficient number, since it is larger than the sum of its proper divisors (343546465).

1621120415 is a wasteful number, since it uses less digits than its factorization.

1621120415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5782.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1621120415 is about 40263.1396565146. The cubic root of 1621120415 is about 1174.7309877589.

Adding to 1621120415 its reverse (5140211261), we get a palindrome (6761331676).

The spelling of 1621120415 in words is "one billion, six hundred twenty-one million, one hundred twenty thousand, four hundred fifteen".