21466650780 has 60 divisors (see below), whose sum is σ = 67341683640. Its totient is φ = 5724439776.

The previous prime is 21466650769. The next prime is 21466650833. The reversal of 21466650780 is 8705666412.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6623890 + ... + 6627129.

It is an arithmetic number, because the mean of its divisors is an integer number (1122361394).

Almost surely, 2^21466650780 is an apocalyptic number.

21466650780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21466650780 is an abundant number, since it is smaller than the sum of its proper divisors (45875032860).

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

21466650780 is a wasteful number, since it uses less digits than its factorization.

21466650780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13251040 (or 13251029 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 21466650780 in words is "twenty-one billion, four hundred sixty-six million, six hundred fifty thousand, seven hundred eighty".