21273281086 has 32 divisors (see below), whose sum is σ = 33055799328. Its totient is φ = 10261954560.

The previous prime is 21273281069. The next prime is 21273281111. The reversal of 21273281086 is 68018237212.

It is a happy number.

It is a congruent 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, 4550046 + ... + 4554718.

It is an arithmetic number, because the mean of its divisors is an integer number (1032993729).

Almost surely, 2^21273281086 is an apocalyptic number.

21273281086 is a deficient number, since it is larger than the sum of its proper divisors (11782518242).

21273281086 is a wasteful number, since it uses less digits than its factorization.

21273281086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5436.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 21273281086 in words is "twenty-one billion, two hundred seventy-three million, two hundred eighty-one thousand, eighty-six".