1621221342 has 16 divisors (see below), whose sum is σ = 3491861520. Its totient is φ = 498837312.

The previous prime is 1621221281. The next prime is 1621221361. The reversal of 1621221342 is 2431221261.

It is a congruent 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, 10392367 + ... + 10392522.

It is an arithmetic number, because the mean of its divisors is an integer number (218241345).

Almost surely, 2^1621221342 is an apocalyptic number.

1621221342 is an abundant number, since it is smaller than the sum of its proper divisors (1870640178).

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

1621221342 is a wasteful number, since it uses less digits than its factorization.

1621221342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20784907.

The product of its digits is 1152, while the sum is 24.

The square root of 1621221342 is about 40264.3929794055. The cubic root of 1621221342 is about 1174.7553658809.

The spelling of 1621221342 in words is "one billion, six hundred twenty-one million, two hundred twenty-one thousand, three hundred forty-two".