21146547747580 has 24 divisors (see below), whose sum is σ = 46338522021792. Its totient is φ = 8090853051072.

The previous prime is 21146547747571. The next prime is 21146547747581. The reversal of 21146547747580 is 8574774564112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21146547747581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22985377527 + ... + 22985378446.

It is an arithmetic number, because the mean of its divisors is an integer number (1930771750908).

Almost surely, 2^{21146547747580} is an apocalyptic number.

21146547747580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21146547747580 is an abundant number, since it is smaller than the sum of its proper divisors (25191974274212).

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

21146547747580 is a wasteful number, since it uses less digits than its factorization.

21146547747580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45970756005 (or 45970756003 counting only the distinct ones).

The product of its (nonzero) digits is 52684800, while the sum is 61.

The spelling of 21146547747580 in words is "twenty-one trillion, one hundred forty-six billion, five hundred forty-seven million, seven hundred forty-seven thousand, five hundred eighty".