1621122105 has 16 divisors (see below), whose sum is σ = 2594300544. Its totient is φ = 864430080.

The previous prime is 1621122071. The next prime is 1621122121. The reversal of 1621122105 is 5012211261.

It is not a de Polignac number, because 1621122105 - 2⁷ = 1621121977 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127225 + ... + 139385.

It is an arithmetic number, because the mean of its divisors is an integer number (162143784).

Almost surely, 2^1621122105 is an apocalyptic number.

1621122105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1621122105 is a deficient number, since it is larger than the sum of its proper divisors (973178439).

1621122105 is a wasteful number, since it uses less digits than its factorization.

1621122105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21056.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1621122105 is about 40263.1606434468. The cubic root of 1621122105 is about 1174.7313959734.

Adding to 1621122105 its reverse (5012211261), we get a palindrome (6633333366).

The spelling of 1621122105 in words is "one billion, six hundred twenty-one million, one hundred twenty-two thousand, one hundred five".