21490109040 has 80 divisors (see below), whose sum is σ = 66634128000. Its totient is φ = 5729423616.

The previous prime is 21490109033. The next prime is 21490109077. The reversal of 21490109040 is 4090109412.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21490108989 and 21490109007.

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, 1649271 + ... + 1662249.

It is an arithmetic number, because the mean of its divisors is an integer number (832926600).

Almost surely, 2^21490109040 is an apocalyptic number.

21490109040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21490109040 is an abundant number, since it is smaller than the sum of its proper divisors (45144018960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21490109040 is a wasteful number, since it uses less digits than its factorization.

21490109040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19894 (or 19888 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 21490109040 in words is "twenty-one billion, four hundred ninety million, one hundred nine thousand, forty".