1621405122 has 16 divisors (see below), whose sum is σ = 3243307392. Its totient is φ = 540385520.

The previous prime is 1621405069. The next prime is 1621405129. The reversal of 1621405122 is 2215041261.

It is a junction number, because it is equal to n+sod(n) for n = 1621405092 and 1621405101.

It is not an unprimeable number, because it can be changed into a prime (1621405129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32008 + ... + 65324.

It is an arithmetic number, because the mean of its divisors is an integer number (202706712).

Almost surely, 2^1621405122 is an apocalyptic number.

1621405122 is an abundant number, since it is smaller than the sum of its proper divisors (1621902270).

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

1621405122 is a wasteful number, since it uses less digits than its factorization.

1621405122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41433.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1621405122 is about 40266.6750800212. The cubic root of 1621405122 is about 1174.7997538943.

Adding to 1621405122 its reverse (2215041261), we get a palindrome (3836446383).

The spelling of 1621405122 in words is "one billion, six hundred twenty-one million, four hundred five thousand, one hundred twenty-two".