1621212106 has 8 divisors (see below), whose sum is σ = 2574866340. Its totient is φ = 762923328.

The previous prime is 1621212097. The next prime is 1621212133. The reversal of 1621212106 is 6012121261.

It can be written as a sum of positive squares in 2 ways, for example, as 1327946481 + 293265625 = 36441^2 + 17125^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23841321 + ... + 23841388.

Almost surely, 2^1621212106 is an apocalyptic number.

1621212106 is a deficient number, since it is larger than the sum of its proper divisors (953654234).

1621212106 is a wasteful number, since it uses less digits than its factorization.

1621212106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47682728.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1621212106 is about 40264.2782873355. The cubic root of 1621212106 is about 1174.7531350399.

Adding to 1621212106 its reverse (6012121261), we get a palindrome (7633333367).

The spelling of 1621212106 in words is "one billion, six hundred twenty-one million, two hundred twelve thousand, one hundred six".