21303964461 has 16 divisors (see below), whose sum is σ = 30662992640. Its totient is φ = 13078981440.

The previous prime is 21303964457. The next prime is 21303964469. The reversal of 21303964461 is 16446930312.

It is not a de Polignac number, because 21303964461 - 2² = 21303964457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303964469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 632341 + ... + 665178.

It is an arithmetic number, because the mean of its divisors is an integer number (1916437040).

Almost surely, 2^21303964461 is an apocalyptic number.

It is an amenable number.

21303964461 is a deficient number, since it is larger than the sum of its proper divisors (9359028179).

21303964461 is a wasteful number, since it uses less digits than its factorization.

21303964461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297956.

The product of its (nonzero) digits is 93312, while the sum is 39.

The spelling of 21303964461 in words is "twenty-one billion, three hundred three million, nine hundred sixty-four thousand, four hundred sixty-one".