21731064546 has 16 divisors (see below), whose sum is σ = 43466802624. Its totient is φ = 7242909264.

The previous prime is 21731064529. The next prime is 21731064577. The reversal of 21731064546 is 64546013712.

It is a happy number.

It is a super-2 number, since 2×21731064546² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132766 + ... + 247161.

It is an arithmetic number, because the mean of its divisors is an integer number (2716675164).

Almost surely, 2^21731064546 is an apocalyptic number.

21731064546 is an abundant number, since it is smaller than the sum of its proper divisors (21735738078).

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

21731064546 is a wasteful number, since it uses less digits than its factorization.

21731064546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389465.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21731064546 in words is "twenty-one billion, seven hundred thirty-one million, sixty-four thousand, five hundred forty-six".