1621221341 has 8 divisors (see below), whose sum is σ = 1752672480. Its totient is φ = 1494382608.

The previous prime is 1621221281. The next prime is 1621221361. The reversal of 1621221341 is 1431221261.

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

It is a cyclic number.

It is not a de Polignac number, because 1621221341 - 2¹⁴ = 1621204957 is a prime.

It is a super-3 number, since 3×1621221341³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621221361) 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, 1152371 + ... + 1153776.

It is an arithmetic number, because the mean of its divisors is an integer number (219084060).

Almost surely, 2^1621221341 is an apocalyptic number.

It is an amenable number.

1621221341 is a deficient number, since it is larger than the sum of its proper divisors (131451139).

1621221341 is a wasteful number, since it uses less digits than its factorization.

1621221341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306203.

The product of its digits is 576, while the sum is 23.

The square root of 1621221341 is about 40264.3929669876. The cubic root of 1621221341 is about 1174.7553656394.

The spelling of 1621221341 in words is "one billion, six hundred twenty-one million, two hundred twenty-one thousand, three hundred forty-one".