21737790105 has 16 divisors (see below), whose sum is σ = 34822540224. Its totient is φ = 11579462720.

The previous prime is 21737790091. The next prime is 21737790121. The reversal of 21737790105 is 50109773712.

It is not a de Polignac number, because 21737790105 - 2¹⁵ = 21737757337 is a prime.

It is a super-2 number, since 2×21737790105² (a number of 21 digits) contains 22 as substring.

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, 863766 + ... + 888575.

It is an arithmetic number, because the mean of its divisors is an integer number (2176408764).

Almost surely, 2^21737790105 is an apocalyptic number.

It is an amenable number.

21737790105 is a deficient number, since it is larger than the sum of its proper divisors (13084750119).

21737790105 is a wasteful number, since it uses less digits than its factorization.

21737790105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753176.

The product of its (nonzero) digits is 92610, while the sum is 42.

The spelling of 21737790105 in words is "twenty-one billion, seven hundred thirty-seven million, seven hundred ninety thousand, one hundred five".