21488729210 has 32 divisors (see below), whose sum is σ = 41774518800. Its totient is φ = 7911548928.

The previous prime is 21488729209. The next prime is 21488729221. The reversal of 21488729210 is 1292788412.

It can be written as a sum of positive squares in 8 ways, for example, as 15388650601 + 6100078609 = 124051^2 + 78103^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191447 + ... + 282186.

Almost surely, 2^21488729210 is an apocalyptic number.

21488729210 is a deficient number, since it is larger than the sum of its proper divisors (20285789590).

21488729210 is a wasteful number, since it uses less digits than its factorization.

21488729210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474002.

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 21488729210 in words is "twenty-one billion, four hundred eighty-eight million, seven hundred twenty-nine thousand, two hundred ten".