1621218834 has 16 divisors (see below), whose sum is σ = 3602708640. Its totient is φ = 540406260.

The previous prime is 1621218829. The next prime is 1621218941. The reversal of 1621218834 is 4388121261.

1621218834 is a `hidden beast` number, since 1 + 621 + 21 + 8 + 8 + 3 + 4 = 666.

It is a Curzon number.

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, 15011232 + ... + 15011339.

It is an arithmetic number, because the mean of its divisors is an integer number (225169290).

Almost surely, 2^1621218834 is an apocalyptic number.

1621218834 is an abundant number, since it is smaller than the sum of its proper divisors (1981489806).

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

1621218834 is a wasteful number, since it uses less digits than its factorization.

1621218834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30022582 (or 30022576 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 1621218834 is about 40264.3618352508. The cubic root of 1621218834 is about 1174.7547601055.

The spelling of 1621218834 in words is "one billion, six hundred twenty-one million, two hundred eighteen thousand, eight hundred thirty-four".