21440103129 has 48 divisors (see below), whose sum is σ = 34643531520. Its totient is φ = 12712250880.

The previous prime is 21440103121. The next prime is 21440103133. The reversal of 21440103129 is 92130104412.

It is a happy number.

It is not a de Polignac number, because 21440103129 - 2³ = 21440103121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21440103121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157134 + ... + 259944.

It is an arithmetic number, because the mean of its divisors is an integer number (721740240).

Almost surely, 2^21440103129 is an apocalyptic number.

21440103129 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21440103129 is a deficient number, since it is larger than the sum of its proper divisors (13203428391).

21440103129 is a wasteful number, since it uses less digits than its factorization.

21440103129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102910 (or 102907 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21440103129 in words is "twenty-one billion, four hundred forty million, one hundred three thousand, one hundred twenty-nine".