1621120004 has 24 divisors (see below), whose sum is σ = 3243273600. Its totient is φ = 694544256.

The previous prime is 1621120001. The next prime is 1621120013. The reversal of 1621120004 is 4000211261.

It is not an unprimeable number, because it can be changed into a prime (1621120001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104972 + ... + 119420.

It is an arithmetic number, because the mean of its divisors is an integer number (135136400).

Almost surely, 2^1621120004 is an apocalyptic number.

1621120004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1621120004 is an abundant number, since it is smaller than the sum of its proper divisors (1622153596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621120004 is a wasteful number, since it uses less digits than its factorization.

1621120004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18467 (or 18465 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1621120004 is about 40263.1345525904. The cubic root of 1621120004 is about 1174.7308884830.

Adding to 1621120004 its reverse (4000211261), we get a palindrome (5621331265).

The spelling of 1621120004 in words is "one billion, six hundred twenty-one million, one hundred twenty thousand, four".