21030809702 has 32 divisors (see below), whose sum is σ = 37001448000. Its totient is φ = 8961054144.

The previous prime is 21030809693. The next prime is 21030809707. The reversal of 21030809702 is 20790803012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030809707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30074 + ... + 207282.

It is an arithmetic number, because the mean of its divisors is an integer number (1156295250).

Almost surely, 2^21030809702 is an apocalyptic number.

21030809702 is a deficient number, since it is larger than the sum of its proper divisors (15970638298).

21030809702 is a wasteful number, since it uses less digits than its factorization.

21030809702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177405 (or 177391 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 21030809702 in words is "twenty-one billion, thirty million, eight hundred nine thousand, seven hundred two".