20721187468 has 12 divisors (see below), whose sum is σ = 36263698632. Its totient is φ = 10360130720.

The previous prime is 20721187423. The next prime is 20721187469. The reversal of 20721187468 is 86478112702.

It is a super-2 number, since 2×20721187468² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20721187469) 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, 2818 + ... + 203593.

It is an arithmetic number, because the mean of its divisors is an integer number (3021974886).

Almost surely, 2^20721187468 is an apocalyptic number.

It is an amenable number.

20721187468 is a deficient number, since it is larger than the sum of its proper divisors (15542511164).

20721187468 is a wasteful number, since it uses less digits than its factorization.

20721187468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231512 (or 231510 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 20721187468 in words is "twenty billion, seven hundred twenty-one million, one hundred eighty-seven thousand, four hundred sixty-eight".