21034440040 has 32 divisors (see below), whose sum is σ = 47331643680. Its totient is φ = 8413037632.

The previous prime is 21034439963. The next prime is 21034440059. The reversal of 21034440040 is 4004443012.

It is a junction number, because it is equal to n+sod(n) for n = 21034439993 and 21034440020.

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, 807459 + ... + 833101.

It is an arithmetic number, because the mean of its divisors is an integer number (1479113865).

Almost surely, 2^21034440040 is an apocalyptic number.

21034440040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21034440040 is an abundant number, since it is smaller than the sum of its proper divisors (26297203640).

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

21034440040 is a wasteful number, since it uses less digits than its factorization.

21034440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46161 (or 46157 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21034440040 its reverse (4004443012), we get a palindrome (25038883052).

The spelling of 21034440040 in words is "twenty-one billion, thirty-four million, four hundred forty thousand, forty".