1636421102 has 4 divisors (see below), whose sum is σ = 2454631656. Its totient is φ = 818210550.

The previous prime is 1636421081. The next prime is 1636421107. The reversal of 1636421102 is 2011246361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2011246361 = 2999 ⋅670639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636421107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409105274 + ... + 409105277.

It is an arithmetic number, because the mean of its divisors is an integer number (613657914).

Almost surely, 2^1636421102 is an apocalyptic number.

1636421102 is a deficient number, since it is larger than the sum of its proper divisors (818210554).

1636421102 is an equidigital number, since it uses as much as digits as its factorization.

1636421102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818210553.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1636421102 is about 40452.7020358344. The cubic root of 1636421102 is about 1178.4152579714.

Adding to 1636421102 its reverse (2011246361), we get a palindrome (3647667463).

The spelling of 1636421102 in words is "one billion, six hundred thirty-six million, four hundred twenty-one thousand, one hundred two".