21030770070 has 64 divisors (see below), whose sum is σ = 57032640000. Its totient is φ = 5513146848.

The previous prime is 21030770069. The next prime is 21030770083. The reversal of 21030770070 is 7007703012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 644170 + ... + 676029.

It is an arithmetic number, because the mean of its divisors is an integer number (891135000).

Almost surely, 2^21030770070 is an apocalyptic number.

21030770070 is an abundant number, since it is smaller than the sum of its proper divisors (36001869930).

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

21030770070 is a wasteful number, since it uses less digits than its factorization.

21030770070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320274 (or 1320268 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 27.

The spelling of 21030770070 in words is "twenty-one billion, thirty million, seven hundred seventy thousand, seventy".