1621213384 has 32 divisors (see below), whose sum is σ = 3475658880. Its totient is φ = 694479744.

The previous prime is 1621213337. The next prime is 1621213393. The reversal of 1621213384 is 4833121261.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142764 + ... + 153700.

It is an arithmetic number, because the mean of its divisors is an integer number (108614340).

Almost surely, 2^1621213384 is an apocalyptic number.

1621213384 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1621213384 is an abundant number, since it is smaller than the sum of its proper divisors (1854445496).

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

1621213384 is a wasteful number, since it uses less digits than its factorization.

1621213384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13597 (or 13593 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 1621213384 is about 40264.2941574790. The cubic root of 1621213384 is about 1174.7534437254.

The spelling of 1621213384 in words is "one billion, six hundred twenty-one million, two hundred thirteen thousand, three hundred eighty-four".