21151929910 has 16 divisors (see below), whose sum is σ = 38077257456. Its totient is φ = 8459931168.

The previous prime is 21151929899. The next prime is 21151929923. The reversal of 21151929910 is 1992915112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 6169 + ... + 205771.

It is an arithmetic number, because the mean of its divisors is an integer number (2379828591).

Almost surely, 2^21151929910 is an apocalyptic number.

21151929910 is a deficient number, since it is larger than the sum of its proper divisors (16925327546).

21151929910 is a wasteful number, since it uses less digits than its factorization.

21151929910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210207.

The product of its (nonzero) digits is 14580, while the sum is 40.

The spelling of 21151929910 in words is "twenty-one billion, one hundred fifty-one million, nine hundred twenty-nine thousand, nine hundred ten".