21031653884 has 6 divisors (see below), whose sum is σ = 36805394304. Its totient is φ = 10515826940.

The previous prime is 21031653883. The next prime is 21031653901. The reversal of 21031653884 is 48835613012.

It is a super-3 number, since 3×21031653884³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031653883) 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 as a sum of consecutive naturals, namely, 2628956732 + ... + 2628956739.

It is an arithmetic number, because the mean of its divisors is an integer number (6134232384).

Almost surely, 2^21031653884 is an apocalyptic number.

It is an amenable number.

21031653884 is a deficient number, since it is larger than the sum of its proper divisors (15773740420).

21031653884 is a wasteful number, since it uses less digits than its factorization.

21031653884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5257913475 (or 5257913473 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 21031653884 in words is "twenty-one billion, thirty-one million, six hundred fifty-three thousand, eight hundred eighty-four".