21346440546 has 16 divisors (see below), whose sum is σ = 42721380000. Its totient is φ = 7110730368.

The previous prime is 21346440539. The next prime is 21346440547. The reversal of 21346440546 is 64504464312.

It is not an unprimeable number, because it can be changed into a prime (21346440547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177711 + ... + 1195698.

It is an arithmetic number, because the mean of its divisors is an integer number (2670086250).

Almost surely, 2^21346440546 is an apocalyptic number.

21346440546 is an abundant number, since it is smaller than the sum of its proper divisors (21374939454).

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

21346440546 is a wasteful number, since it uses less digits than its factorization.

21346440546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374913.

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 21346440546 in words is "twenty-one billion, three hundred forty-six million, four hundred forty thousand, five hundred forty-six".