1621211107 has 2 divisors, whose sum is σ = 1621211108. Its totient is φ = 1621211106.

The previous prime is 1621211087. The next prime is 1621211131. The reversal of 1621211107 is 7011121261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1621211107 - 2⁷ = 1621210979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621211167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810605553 + 810605554.

It is an arithmetic number, because the mean of its divisors is an integer number (810605554).

Almost surely, 2^1621211107 is an apocalyptic number.

1621211107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621211107 is an equidigital number, since it uses as much as digits as its factorization.

1621211107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 22.

The square root of 1621211107 is about 40264.2658817965. The cubic root of 1621211107 is about 1174.7528937434.

Adding to 1621211107 its reverse (7011121261), we get a palindrome (8632332368).

The spelling of 1621211107 in words is "one billion, six hundred twenty-one million, two hundred eleven thousand, one hundred seven".