21115351012 has 24 divisors (see below), whose sum is σ = 42339286080. Its totient is φ = 9026168160.

The previous prime is 21115350967. The next prime is 21115351013. The reversal of 21115351012 is 21015351112.

It is not an unprimeable number, because it can be changed into a prime (21115351013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 958414 + ... + 980197.

It is an arithmetic number, because the mean of its divisors is an integer number (1764136920).

Almost surely, 2^21115351012 is an apocalyptic number.

It is an amenable number.

21115351012 is an abundant number, since it is smaller than the sum of its proper divisors (21223935068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21115351012 is a wasteful number, since it uses less digits than its factorization.

21115351012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939011 (or 1939009 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

The spelling of 21115351012 in words is "twenty-one billion, one hundred fifteen million, three hundred fifty-one thousand, twelve".