21110425040 has 40 divisors (see below), whose sum is σ = 49144250400. Its totient is φ = 8433415296.

The previous prime is 21110425003. The next prime is 21110425051. The reversal of 21110425040 is 4052401112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 104690 + ... + 230609.

It is an arithmetic number, because the mean of its divisors is an integer number (1228606260).

Almost surely, 2^21110425040 is an apocalyptic number.

21110425040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110425040 is an abundant number, since it is smaller than the sum of its proper divisors (28033825360).

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

21110425040 is a wasteful number, since it uses less digits than its factorization.

21110425040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336099 (or 336093 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21110425040 its reverse (4052401112), we get a palindrome (25162826152).

The spelling of 21110425040 in words is "twenty-one billion, one hundred ten million, four hundred twenty-five thousand, forty".