1621218867 has 8 divisors (see below), whose sum is σ = 2182612224. Its totient is φ = 1070319048.

The previous prime is 1621218829. The next prime is 1621218941. The reversal of 1621218867 is 7688121261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1621218867 - 2²⁰ = 1620170291 is a prime.

It is a super-2 number, since 2×1621218867² = 5256701229433527378, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1621218817) 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, 2623023 + ... + 2623640.

It is an arithmetic number, because the mean of its divisors is an integer number (272826528).

Almost surely, 2^1621218867 is an apocalyptic number.

1621218867 is a deficient number, since it is larger than the sum of its proper divisors (561393357).

1621218867 is a wasteful number, since it uses less digits than its factorization.

1621218867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5246769.

The product of its digits is 64512, while the sum is 42.

The square root of 1621218867 is about 40264.3622450425. The cubic root of 1621218867 is about 1174.7547680763.

The spelling of 1621218867 in words is "one billion, six hundred twenty-one million, two hundred eighteen thousand, eight hundred sixty-seven".