1621221442 has 8 divisors (see below), whose sum is σ = 2455442496. Its totient is φ = 802740612.

The previous prime is 1621221409. The next prime is 1621221443. The reversal of 1621221442 is 2441221261.

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

It is not an unprimeable number, because it can be changed into a prime (1621221443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3934798 + ... + 3935209.

It is an arithmetic number, because the mean of its divisors is an integer number (306930312).

Almost surely, 2^1621221442 is an apocalyptic number.

1621221442 is a deficient number, since it is larger than the sum of its proper divisors (834221054).

1621221442 is a wasteful number, since it uses less digits than its factorization.

1621221442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7870112.

The product of its digits is 1536, while the sum is 25.

The square root of 1621221442 is about 40264.3942211975. The cubic root of 1621221442 is about 1174.7553900346.

The spelling of 1621221442 in words is "one billion, six hundred twenty-one million, two hundred twenty-one thousand, four hundred forty-two".