21210120998 has 32 divisors (see below), whose sum is σ = 35144036352. Its totient is φ = 9520204000.

The previous prime is 21210120973. The next prime is 21210121013. The reversal of 21210120998 is 89902101212.

It is a congruent number.

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, 838565 + ... + 863487.

It is an arithmetic number, because the mean of its divisors is an integer number (1098251136).

Almost surely, 2^21210120998 is an apocalyptic number.

21210120998 is a deficient number, since it is larger than the sum of its proper divisors (13933915354).

21210120998 is a wasteful number, since it uses less digits than its factorization.

21210120998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25420.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 21210120998 in words is "twenty-one billion, two hundred ten million, one hundred twenty thousand, nine hundred ninety-eight".