21290680436 has 12 divisors (see below), whose sum is σ = 37730320320. Its totient is φ = 10510588920.

The previous prime is 21290680427. The next prime is 21290680501. The reversal of 21290680436 is 63408609212.

It is a junction number, because it is equal to n+sod(n) for n = 21290680393 and 21290680402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33687470 + ... + 33688101.

It is an arithmetic number, because the mean of its divisors is an integer number (3144193360).

Almost surely, 2^21290680436 is an apocalyptic number.

It is an amenable number.

21290680436 is a deficient number, since it is larger than the sum of its proper divisors (16439639884).

21290680436 is a wasteful number, since it uses less digits than its factorization.

21290680436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67375654 (or 67375652 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21290680436 in words is "twenty-one billion, two hundred ninety million, six hundred eighty thousand, four hundred thirty-six".