21711020090 has 16 divisors (see below), whose sum is σ = 39338645760. Its totient is φ = 8626894800.

The previous prime is 21711020087. The next prime is 21711020101. The reversal of 21711020090 is 9002011712.

It is a super-3 number, since 3×21711020090³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7187570 + ... + 7190589.

It is an arithmetic number, because the mean of its divisors is an integer number (2458665360).

Almost surely, 2^21711020090 is an apocalyptic number.

21711020090 is a deficient number, since it is larger than the sum of its proper divisors (17627625670).

21711020090 is a wasteful number, since it uses less digits than its factorization.

21711020090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14378317.

The product of its (nonzero) digits is 252, while the sum is 23.

The spelling of 21711020090 in words is "twenty-one billion, seven hundred eleven million, twenty thousand, ninety".