21681460446 has 16 divisors (see below), whose sum is σ = 43364970000. Its totient is φ = 7226811968.

The previous prime is 21681460421. The next prime is 21681460511. The reversal of 21681460446 is 64406418612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21681460398 and 21681460407.

It is a congruent number.

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, 75490 + ... + 221498.

It is an arithmetic number, because the mean of its divisors is an integer number (2710310625).

Almost surely, 2^21681460446 is an apocalyptic number.

21681460446 is an abundant number, since it is smaller than the sum of its proper divisors (21683509554).

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

21681460446 is a wasteful number, since it uses less digits than its factorization.

21681460446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170763.

The product of its (nonzero) digits is 221184, while the sum is 42.

The spelling of 21681460446 in words is "twenty-one billion, six hundred eighty-one million, four hundred sixty thousand, four hundred forty-six".