21406501298 has 32 divisors (see below), whose sum is σ = 39544619520. Its totient is φ = 8463165120.

The previous prime is 21406501169. The next prime is 21406501307. The reversal of 21406501298 is 89210560412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258743 + ... + 331301.

It is an arithmetic number, because the mean of its divisors is an integer number (1235769360).

Almost surely, 2^21406501298 is an apocalyptic number.

21406501298 is a deficient number, since it is larger than the sum of its proper divisors (18138118222).

21406501298 is a wasteful number, since it uses less digits than its factorization.

21406501298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74202.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 21406501298 in words is "twenty-one billion, four hundred six million, five hundred one thousand, two hundred ninety-eight".