21561769030 has 8 divisors (see below), whose sum is σ = 38811184272. Its totient is φ = 8624707608.

The previous prime is 21561768959. The next prime is 21561769039. The reversal of 21561769030 is 3096716512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21561769039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078088442 + ... + 1078088461.

It is an arithmetic number, because the mean of its divisors is an integer number (4851398034).

Almost surely, 2^21561769030 is an apocalyptic number.

21561769030 is a deficient number, since it is larger than the sum of its proper divisors (17249415242).

21561769030 is a wasteful number, since it uses less digits than its factorization.

21561769030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156176910.

The product of its (nonzero) digits is 68040, while the sum is 40.

The spelling of 21561769030 in words is "twenty-one billion, five hundred sixty-one million, seven hundred sixty-nine thousand, thirty".