9961721102 has 32 divisors (see below), whose sum is σ = 15617691648. Its totient is φ = 4760100000.

The previous prime is 9961721041. The next prime is 9961721167. The reversal of 9961721102 is 2011271699.

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, 2697077 + ... + 2700767.

It is an arithmetic number, because the mean of its divisors is an integer number (488052864).

Almost surely, 2^9961721102 is an apocalyptic number.

9961721102 is a deficient number, since it is larger than the sum of its proper divisors (5655970546).

9961721102 is a wasteful number, since it uses less digits than its factorization.

9961721102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4256.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 9961721102 is about 99808.4219993483. The cubic root of 9961721102 is about 2151.6821954317.

The spelling of 9961721102 in words is "nine billion, nine hundred sixty-one million, seven hundred twenty-one thousand, one hundred two".