21280933016 has 16 divisors (see below), whose sum is σ = 45601999440. Its totient is φ = 9120399840.

The previous prime is 21280932997. The next prime is 21280933031. The reversal of 21280933016 is 61033908212.

It is a super-2 number, since 2×21280933016² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190008275 + ... + 190008386.

It is an arithmetic number, because the mean of its divisors is an integer number (2850124965).

Almost surely, 2^21280933016 is an apocalyptic number.

It is an amenable number.

21280933016 is an abundant number, since it is smaller than the sum of its proper divisors (24321066424).

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

21280933016 is a wasteful number, since it uses less digits than its factorization.

21280933016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380016674 (or 380016670 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 21280933016 in words is "twenty-one billion, two hundred eighty million, nine hundred thirty-three thousand, sixteen".