21214725216 has 24 divisors (see below), whose sum is σ = 55688653944. Its totient is φ = 7071575040.

The previous prime is 21214725209. The next prime is 21214725223. The reversal of 21214725216 is 61252741212.

It is an interprime number because it is at equal distance from previous prime (21214725209) and next prime (21214725223).

It is a tau number, because it is divible by the number of its divisors (24).

It is an alternating number because its digits alternate between even and odd.

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, 110493265 + ... + 110493456.

It is an arithmetic number, because the mean of its divisors is an integer number (2320360581).

Almost surely, 2^21214725216 is an apocalyptic number.

It is an amenable number.

21214725216 is an abundant number, since it is smaller than the sum of its proper divisors (34473928728).

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

21214725216 is a wasteful number, since it uses less digits than its factorization.

21214725216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220986734 (or 220986726 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The spelling of 21214725216 in words is "twenty-one billion, two hundred fourteen million, seven hundred twenty-five thousand, two hundred sixteen".