129822821642 has 4 divisors (see below), whose sum is σ = 194734232466. Its totient is φ = 64911410820.

The previous prime is 129822821629. The next prime is 129822821657. The reversal of 129822821642 is 246128228921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 105747885721 + 24074935921 = 325189^2 + 155161^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32455705409 + ... + 32455705412.

Almost surely, 2^129822821642 is an apocalyptic number.

129822821642 is a deficient number, since it is larger than the sum of its proper divisors (64911410824).

129822821642 is an equidigital number, since it uses as much as digits as its factorization.

129822821642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64911410823.

The product of its digits is 442368, while the sum is 47.

The spelling of 129822821642 in words is "one hundred twenty-nine billion, eight hundred twenty-two million, eight hundred twenty-one thousand, six hundred forty-two".