21418896109 has 16 divisors (see below), whose sum is σ = 23624753152. Its totient is φ = 19293640128.

The previous prime is 21418896101. The next prime is 21418896143. The reversal of 21418896109 is 90169881412.

It is a cyclic number.

It is not a de Polignac number, because 21418896109 - 2³ = 21418896101 is a prime.

It is a super-2 number, since 2×21418896109² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21418896101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 607252 + ... + 641554.

It is an arithmetic number, because the mean of its divisors is an integer number (1476547072).

Almost surely, 2^21418896109 is an apocalyptic number.

It is an amenable number.

21418896109 is a deficient number, since it is larger than the sum of its proper divisors (2205857043).

21418896109 is a wasteful number, since it uses less digits than its factorization.

21418896109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35476.

The product of its (nonzero) digits is 248832, while the sum is 49.

The spelling of 21418896109 in words is "twenty-one billion, four hundred eighteen million, eight hundred ninety-six thousand, one hundred nine".